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Stockholders' Equity
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Stockholders' Equity STOCKHOLDERS’ EQUITY
Preferred Stock
The Company has 10 million shares of undesignated preferred stock authorized but not issued with rights and preferences determined by the Company’s Board of Directors at the time of issuance of such shares. As of June 30, 2024 and December 31, 2023, there were no shares of preferred stock issued and outstanding.
Common Stock
The Company has two classes of authorized common stock, Class A common stock and Class B common stock. Holders of Class A common stock are entitled to one vote for each share of Class A common stock held on all matters submitted to a vote of stockholders and holders of Class B common stock are entitled to ten votes for each share of Class B common stock held on all matters submitted to a vote of stockholders. Except with respect to voting, the rights of the holders of Class A and Class B common stock are identical. Shares of Class B common stock are voluntarily convertible into shares of Class A common stock at the option of the holder and are generally automatically converted into shares of the Company's Class A common stock upon sale or transfer. Shares issued in connection with exercises of stock options, vesting of restricted stock units, or shares purchased under the employee stock purchase plan are generally automatically converted into shares of the Company’s Class A common stock.
Common Stock Reserved for Future Issuance
As of June 30, 2024, the Company’s common stock reserved for issuance in the future is as follows (in thousands):
As of
 June 30, 2024
Common stock awards granted under equity incentive plans12,076 
Common stock awards available for issuance under the 2017 Employee Stock Purchase Plan (1)
5,089 
Common stock awards available for issuance under the 2017 Equity Incentive Plan35,777 
Total reserved shares of common stock52,942 
(1) The Company has not issued any common stock pursuant to the 2017 Employee Stock Purchase Plan.
Equity Incentive Plans
The Company currently grants equity under the 2017 Equity Incentive Plan (the “2017 Plan”). The 2017 Plan became effective September 2017 in connection with the Company’s initial public offering (“IPO”). The 2017 Plan provides for the grant of incentive stock options to the Company’s employees and for the grant of non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of equity compensation to the Company’s employees, directors and consultants. The outstanding equity relates to the 2017 Plan and the 2008 Equity Incentive Plan (“2008 Plan”), a pre-IPO plan. No additional equity grants have been made pursuant to the 2008 Plan subsequent to the IPO.
The equity granted under the 2017 Plan is subject to continuous service. Stock options granted under the 2017 Plan generally are granted at a price per share equivalent to the fair market value on the date of grant. Recipients of option grants who possess more than 10% of the combined voting power of the Company are subject to certain limitations, and incentive stock options granted to such recipients are at a price per share no less than 110% of the fair market value on the date of grant.
Restricted Stock Units
Restricted stock unit activity for the six months ended June 30, 2024 is as follows (in thousands, except per share data):
 
Number of
Shares
 
Weighted-Average
Grant Date Fair
Value per Share
Balance as of December 31, 2023
8,674 $97.33 
Awarded316 62.30 
Released(1,585)110.11 
Forfeited(416)100.37 
Balance as of June 30, 2024
6,989 $92.66 
As of June 30, 2024, the Company had $507.9 million of unrecognized stock-based compensation expense related to unvested restricted stock units that is expected to be recognized over a weighted-average period of approximately 1.9 years.
Stock Options
Stock option activity for the six months ended June 30, 2024 is as follows (in thousands, except years and per share data):
 
Number of
Shares
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Life (Years)
Aggregate
Intrinsic
Value
Balance as of December 31, 2023
5,310 $75.55 6.8
Granted92 64.34 — 
Exercised(287)30.24 — 
Forfeited and expired(28)141.30 — 
Balance as of June 30, 2024
5,087 $77.54 6.5$61,416 
 
Options exercisable as of June 30, 2024
3,572 $68.52 5.8$55,185 
As of June 30, 2024, the Company had $50.7 million of unrecognized stock-based compensation expense related to unvested stock options that is expected to be recognized over a weighted-average period of approximately 1.8 years.
Stock-Based Compensation
The Company measures the cost of employee services received in exchange for an equity award based on the grant date fair value of the award. Stock options granted to employees generally vest over one to four years and have a term of ten years. Restricted stock units generally vest over one to four years.
The following table shows the total stock-based compensation expense for the three and six months ended June 30, 2024 and 2023 (in thousands):
 Three Months EndedSix Months Ended
 June 30, 2024June 30, 2023June 30, 2024June 30, 2023
Cost of revenue, platform$282 $349 $696 $688 
Cost of revenue, devices139 812 1,038 1,616 
Research and development33,365 34,824 70,955 73,487 
Sales and marketing31,431 31,225 63,952 65,364 
General and administrative23,179 22,369 46,387 44,896 
Total stock-based compensation$88,396 $89,579 $183,028 $186,051