Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses and Other Current Liabilities Accounts Payable, Current Accounts payable Accounts Receivable, Gross, Current Accounts receivable Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $3,378 and $2,811 at December 31, 2015 and 2014, respectively Accounts receivable, net Accrued Expenses and Other Current Liabilities [Line Items] Accrued Expenses and Other Current Liabilities [Line Items] Accrued Expenses and Other Current Liabilities [Line Items] Accrued Expenses and Other Current Liabilities [Table] Accrued Expenses and Other Current Liabilities [Table] Accrued Expenses and Other Current Liabilities [Table] Accrued Income Taxes, Current Related income tax liability Accrued Legal Fees [Member] Accrued Legal Fees [Member] Accrued legal fees Accrued Liabilities, Current Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Marketing And Advertising [Member] Accrued Marketing And Advertising [Member] Accrued marketing and advertising Accrued Purchased Content [Member] Accrued Purchased Content [Member] Accrued purchased content Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated amortization and depreciation Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Acquisition-related Costs [Member] Direct and incremental acquisition-related costs Additional area of real estate property leased. Additional Area of Real Estate Property Leased Additional area of office space leased Additional Cash and Cash Equivalent Related Text Original maturities date of money market funds Additional Paid in Capital, Common Stock Additional paid-in capital Additional Paid-in Capital [Member] Additional Paid-in Capital Adjustments Related to Tax Withholding for Share-based Compensation Shares and value of restricted stock units withheld for tax liability Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Fair value of equity awards assumed in connection with an acquisition Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation expense Adjustments to additional paid in capital, share based compensation vesting acceleration in connection with restructuring. Adjustments to Additional Paid in Capital, Share Based Compensation Vesting Acceleration in Connection with Restructuring Equity award vesting acceleration in connection with restructuring Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Stock issuance costs Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities, net of amounts assumed in connection with acquisitions: Advertising Costs, Policy [Policy Text Block] Advertising Costs Advertising Expense Advertising expenses Advertising Revenue Display revenue Allocated Share-based Compensation Expense Share-based compensation Allowance For Doubtful Accounts [Abstract] Allowance For Doubtful Accounts [Abstract] Allowance for doubtful accounts: Allowance for Doubtful Accounts Receivable, Current Balance, end of period Balance, beginning of period Accounts receivable, allowance for doubtful accounts Less: allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Write-offs Less: write-offs, net of recoveries and other adjustments Amended And Restated Two Thousand Eleven Equity Incentive Plan [Member] Amended And Restated Two Thousand Eleven Equity Incentive Plan [Member] Amended and Restated 2011 Incentive Plan Amendment Flag Amendment Flag Amortization Of Acquired Intangibles [Member] Amortization Of Acquired Intangibles [Member] Amortization expense of acquired intangible assets Amortization Of Capitalized Website Development Costs [Member] Amortization Of Capitalized Website Development Costs [Member] Amortization of capitalized website development costs Amortization of Debt Discount (Premium) Amortization of bond premium The amount of noncash expense included in results of operations related to lease agreements. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Amortization Of Deferred Rent Deferred rent Amortization of Intangible Assets Amortization of website development costs and intangible assets included in technology and development Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Class A common stock and Class C capital stock equivalents excluded from calculations of diluted net loss per share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Area of Real Estate Property Rentable area of the premises Assets Total assets Assets [Abstract] Assets Assets, Current Total current assets Assets, Current [Abstract] Current assets: Assets, Fair Value Disclosure Total Disposal Group, Including Discontinued Operation, Assets Total assets Disposal Group, Including Discontinued Operation, Assets [Abstract] Assets Available-for-sale Debt Securities, Amortized Cost Basis Total Available-for-sale Securities Estimated Fair Market Value Short-term investments Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Losses Available-for-sale Securities, Amortized Cost Basis Amortized Cost Available for sale securities, debt maturities, after one through two years, amortized cost. Available-for-sale Securities, Debt Maturities, After One Through Two Years, Amortized Cost Amortized Cost, Due after one year through two years Available for sale securities, debt maturities, after one through two years, fair value. Available for Sale Securities, Debt Maturities, after One Through Two Years, Fair Value Estimated Fair Market Value, Due after one year through two years Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized Cost, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Estimated Fair Market Value, Due in one year or less Available-for-sale Securities, Debt Securities Total Award Type [Axis] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Bellevue Washington [Member] Bellevue Washington [Member] Bellevue, Washington Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Date of Acquisition Agreement Agreement date Business Acquisition, Effective Date of Acquisition Acquisition date Business acquisition, effective date Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Pro Forma Information [Abstract] Business Acquisition, Pro Forma Information [Abstract] Business Acquisition, Pro Forma Information [Table Text Block] Pro Forma Condensed Combined Financial Information Business acquisitions proforma adjustments. Business Acquisitions ProForma Adjustments Pro forma adjustments Business Acquisition, Pro Forma Net Income (Loss) Net loss Business Acquisition, Pro Forma Revenue Revenue Business Combination, Acquisition Related Costs Acquisition-related costs Business combination cash paid for cancellation of vested options to purchase shares of common stock. Business Combination Cash Paid For Cancellation Of Vested Options To Purchase Shares Of Common Stock Cash paid for the cancellation of vested options to purchase shares of DotLoop's common stock Business combination cash paid for outstanding stock and warrants. Business Combination Cash Paid For Outstanding Stock And Warrants Cash paid for the outstanding stock and warrants of DotLoop Business Combination, Consideration Transferred Business acquisition, purchase price Total purchase price Total purchase price Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Value of stock issued and substituted share awards attributable to pre-combination service Business Combination Disclosure [Text Block] Acquisitions Business combination purchase price allocation debt premium. Business Combination Purchase Price Allocation Debt Premium Debt premium recorded in additional paid-in capital Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Business combination recognized identifiable assets acquired and liabilities assumed assets other. Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Assets Other Other assets Business combination recognized identifiable assets acquired and liabilities assumed cash, cash equivalents and marketable securities. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash, Cash Equivalents And Marketable Securities Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Cash, cash equivalents, accounts receivable, prepaid expenses and other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accounts payable, accrued expenses and other current liabilities Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable accrued expenses and other current liabilities and accrued compensation and benefits and deferred revenue. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable Accrued Expenses Other Current Liabilities Accrued Compensation Benefits And Deferred Revenue Accounts payable, accrued expenses and other current liabilities, accrued compensation and benefits, and deferred revenue Business combination, recognized identifiable assets acquired and liabilities assumed, current liabilities accrued compensation and benefits. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Accrued Compensation And Benefits Accrued compensation and benefits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue Deferred revenue Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt Long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current Deferred tax liability Deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Identifiable intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Indefinite-lived intangible asset Total Preliminary Estimated Fair Value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Deferred tax liabilities and other long-term liabilities Business combination recognized identifiable assets acquired and liabilities assumed prepaid expense and other current assets. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Prepaid Expense And Other Current Assets Prepaid expenses and other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property and equipment Business combination recognized identifiable assets acquired and liabilities assumed property plant and equipment and other assets. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment And Other Assets Property and equipment and other assets Business combination recognized identifiable assets acquired and liabilities assumed receivables. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Receivables Accounts receivable Business combination, recognized identifiable assets acquired and liabilities assumed, restricted cash. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash Restricted cash Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total preliminary estimated purchase price Business Combinations [Abstract] Business Combinations [Abstract] Business combination share exchange ratio for acquisition. Business Combination Share Exchange Ratio For Acquisition Common stock exchange ratio Business Combinations Policy [Policy Text Block] Business Combinations Business combination transaction expenses and other costs incurred. Business Combination Transaction Expenses And Other Costs Incurred Certain transaction expenses and other costs incurred by DotLoop Business Exit Costs Restructuring costs for contract termination costs Capitalized Computer Software, Additions Capitalization of website development costs Cash Acquired from Acquisition Cash acquired in acquisition, net Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Cash equivalents Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents during period Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash Cash Equivalents Marketable Securities And Restricted Cash [Text Block] Cash Cash Equivalents Marketable Securities And Restricted Cash [Text Block] Cash, Cash Equivalents, Investments and Restricted Cash Cash Equivalents [Member] Cash Equivalents Cash [Member] Cash Certificates of Deposit [Member] Certificates of Deposit Chief Executive Officer [Member] Chief Executive Officer [Member] Class common stock offering price. Class Common Stock Offering Price Class A common stock at an offering price Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Commercial Paper [Member] Commercial Paper Commitments and Contingencies Commitments and contingencies (Note 17) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common class A and class C. Common Class -A- And Class -C- [Member] Class A Common Stock and Class C Capital Stock Common Class A [Member] Class A Common Stock Common Class B [Member] Class B Common Stock Common Class C [Member] Class C Capital Stock Common Stock, Capital Shares Reserved for Future Issuance Total Common Stock, Conversion Basis Converted share of fully paid Common Stock [Member] Common Stock: Class A Common Stock, Class B Common Stock and Class C Capital Stock Common Stock, Par or Stated Value Per Share Common stock, par value Common stock, par value after Class C Stock Split Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Shares issuable upon conversion of outstanding Class B common stock Common Stock, Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Common stock, shares outstanding Common Stock, Value, Issued Common stock Common stock voting rights held per share. Common Stock Voting Rights Held Per Share Common stock holders voting right Compensation and Employee Benefit Plans [Text Block] Employee Benefit Plan Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive loss: Computer Equipment [Member] Computer equipment Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Credit Risk Concentration Risk, Percentage Percentage of revenue Concentration Risk Type [Domain] Concentration Risk Type [Domain] Construction in Progress [Member] Construction-in-progress Contract Termination [Member] Contract Termination Costs Conversion of common shares to common stock. Conversion Of Common Shares To Common Stock Convertible common stock Conversion of common stock conversion ratio. Conversion Of Common Stock Conversion Ratio Conversion of common stock conversion ratio Conversion of Stock, Shares Converted Number of common stock converted Conversion of Stock, Shares Issued Number of common stock issued Convertible Debt, Fair Value Disclosures Fair value of convertible notes Convertible Senior Notes Two Point Seven Five Percent Due Twenty Twenty [Member] Convertible Senior Notes Two Point Seven Five Percent Due Twenty Twenty [Member] 2.75% Convertible Senior Notes Due 2020 Corporate Debt Securities [Member] Corporate Notes and Bonds Cost of Revenue Cost of revenue (exclusive of amortization) Cost of Sales [Member] Cost of Revenue Cost of Sales, Policy [Policy Text Block] Cost of Revenue Costs and Expenses Total costs and expenses Costs and Expenses [Abstract] Costs and expenses: Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Restructuring Counterparty Name [Axis] Counterparty Name [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer Relationships [Member] Customer Relationships Date of first vesting. Date Of First Vesting Vesting commencement date of restricted shares Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Text Block] Convertible Senior Notes Debt Instrument [Axis] Debt Instrument [Axis] Long-term Debt, Gross Debt instrument carrying value Debt Instrument, Convertible, Conversion Price Initial conversion price Debt Instrument, Convertible, Conversion Ratio Debt instrument, conversion rate shares Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt instrument, convertible threshold consecutive trading days Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Debt instrument, convertible threshold percentage Debt Instrument, Convertible, Threshold Trading Days Debt instrument, convertible threshold trading days Debt Instrument, Face Amount Debt instrument, aggregate principal amount Debt Instrument Frequency Of Interest Periodic Payment Debt Instrument Frequency Of Interest Periodic Payment Debt instrument, frequency of period payment Debt Instrument, Interest Rate, Stated Percentage Debt instrument, interest rate stated percentage Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument Principal Amount Denomination For Conversion Into Common Stock Debt Instrument Principal Amount Denomination For Conversion Into Common Stock Debt instrument, conversion rate principal amount Debt Instrument, Redemption Period, End Date Debt instrument, due date Debt Instrument, Redemption Period, Start Date Debt instrument, redemption period start date Debt Instrument, Redemption Price, Percentage Repurchase price percentage of principal amount Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument, Unamortized Premium Debt premium recorded in additional paid-in capital Debt premium recorded in additional paid in capital in connection with acquisition. Debt Premium Recorded In Additional Paid In Capital In Connection With Acquisition Debt premium recorded in additional paid-in capital in connection with an acquisition Deferred Federal Income Tax Expense (Benefit) Federal Deferred Income Tax Expense (Benefit) Deferred income tax benefit Deferred Rent Credit, Current Deferred rent, current portion Deferred Rent Credit, Noncurrent Deferred rent, net of current portion Deferred Revenue, Current Deferred revenue