CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net loss	$ (108,134)	$ (40,582)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Stock-based compensation	186,370	7,380
Inventory write-downs	951	10,172
Depreciation	2,180	1,241
Non-cash operating lease expense	1,687	886
Warrants contra revenue	946	438
Accretion of discounts on marketable securities	(4,868)	(1,039)
Changes in operating assets and liabilities:
Accounts receivable, net	(17,054)	(6,494)
Inventory	(1,271)	597
Prepaid expenses and other assets	(4,998)	(220)
Accounts payable	11,723	(663)
Accrued expenses and other liabilities	31,094	2,184
Operating lease liability	(1,653)	(1,015)
Net cash provided by (used in) operating activities	96,973	(27,115)
Cash flows from investing activities
Purchases of property and equipment	(18,797)	(1,750)
Purchases of marketable securities	(724,921)	(102,836)
Maturities of marketable securities	36,579	29,000
Sales of marketable securities	40,998	63,778
Net cash used in investing activities	(666,141)	(11,808)
Cash flows from financing activities
Proceeds from issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions	672,198	0
Payment of deferred offering costs	(4,801)	(105)
Tax withholding related to net share settlements of restricted stock units	(20,111)	0
Proceeds from exercises of stock options, net of repurchases	2,901	662
Net cash provided by financing activities	650,187	557
Net increase (decrease) in cash and cash equivalents	81,019	(38,366)
Cash and cash equivalents
Beginning of the period	45,098	76,088
End of the period	126,117	37,722
Supplemental disclosures of cash flow information:
Conversion of redeemable convertible preferred stock into common stock in connection with initial public offering	255,127	0
Purchases of property and equipment in accounts payable, accrued expenses and other current liabilities	14,132	510
Right-of-use assets obtained in exchange for lease obligations	$ 844	$ 1,342

Class Of Warrants Or Right Contra Revenue

No definition available.

Name:	alab_ClassOfWarrantsOrRightContraRevenue
Namespace Prefix:	alab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.