Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (116,791)	$ (96,426)	$ (95,655)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,440	5,358	4,744
Stock-based compensation expense	13,965	10,213	11,874
Amortization of debt discount and debt issuance costs	5,367	1,609	2,777
Amortization of right-of-use asset	3,133	2,735	2,889
Accretion of discounts on investments, net	(1,676)
Change in fair value of common stock warrant liability	43,894	16,395	2,320
Change in fair value of derivative liability	(7,311)	222	(4,158)
Change in fair value of convertible note			5,120
Loss on extinguishment of debt	6,360
Paid-in-kind interest			144
Non-cash interest charges	1,071	2,016	865
Change in allowance for credit losses	188	(244)	1,190
Changes in assets and liabilities:
Accounts receivable, net	(4,892)	(3,849)	(9,350)
Prepaid expenses and other current assets	(7,943)	(998)	(357)
Other non-current assets	(733)	(2,698)	(402)
Accounts payable	218	(327)	(623)
Accrued expenses and other current liabilities	9,313	426	3,759
Operating lease liabilities	(3,715)	(3,218)	(1,761)
Other non-current liabilities	89	(215)	190
Net cash used in operating activities	(54,023)	(69,001)	(76,434)
Cash flows from investing activities:
Purchase of property and equipment	(5,025)	(4,357)	(6,105)
Purchases of investments	(233,543)
Net cash used in investing activities	(238,568)	(4,357)	(6,105)
Cash flows from financing activities:
Proceeds from issuance of Series F redeemable convertible preferred shares, net of issuance costs			168,957
Proceeds from initial public offering, net of issuance costs	332,387
Proceeds from convertible notes offering, net of issuance costs	72,769
Proceeds from exercise of stock options	3,298	4,564	589
Repayment of term loan	(115,137)
Payments of exit, prepayment penalty and lender fees	(6,764)	(2,327)
Payment of taxes related to vested restricted stock units	(510)
Repurchase of common stock			(228)
Net cash provided by financing activities	286,043	2,237	169,318
Effect of foreign exchange rates	191	(271)	(504)
Net increase (decrease) in cash and cash equivalents	(6,357)	(71,392)	86,275
Balance, beginning of period	55,842	127,234	40,959
Balance, end of period	49,485	55,842	127,234
Supplemental disclosure of cash flow information:
Cash paid for interest	8,573	19,163	20,800
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable	81		808
Right-of-use asset obtained in exchange for lease obligation	1,816	579
Conversion of redeemable convertible preferred stock to common stock upon IPO	768,566
Conversion of convertible notes to common stock upon IPO	94,139
Conversion of term loan principal to convertible notes	23,000
Reclassification of warrant liability to common stock upon net exercise	64,729
Issuance of convertible notes to certain employees in lieu of cash compensation	1,353
Reclassification of term loan debt discount to convertible notes debt discount	$ 239
Derecognition of derivative liability in connection with debt refinancing		1,125
Unpaid deferred offering costs included in accounts payable and accrued expenses and other current liabilities		$ 413
Reduction in right-of-use asset and lease obligation due to amendment in lease terms			1,776
Deemed dividend upon down round of redeemable convertible preferred stock			26,794
Conversion of convertible note into Series F-1 redeemable convertible preferred stock			$ 61,186