Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows used in operating activities:
Net loss	$ (70,743)	$ (97,739)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation expense	21,427	20,876
Depreciation and amortization expense	1,338	1,450
Reduction in carrying amount of right-of-use asset	4,790	4,596
Net accretion of discounts on marketable securities	(4,315)	(2,817)
Amortization of debt discount − related party	0	405
Loss on early extinguishment of debt	0	621
Other	53	120
Changes in operating assets and liabilities:
Accounts receivable	1,458	973
Prepaid expenses and other current and long-term assets	(4,300)	1,404
Accounts payable	57	104
Accrued expenses and other current liabilities	(5,242)	(3,866)
Operating lease liability	(3,881)	(3,489)
Deferred revenue	12,133	(5,467)
Net cash used in operating activities	(47,225)	(82,829)
Cash flows (used in) provided by investing activities:
Proceeds from maturities of marketable securities	178,781	219,975
Purchases of marketable securities	(243,537)	(92,020)
Purchases of property and equipment, net	(184)	(1,551)
Net cash (used in) provided by investing activities	(64,940)	126,404
Cash flows provided by (used in) financing activities:
Proceeds from exercise of stock options	667	58
Payments for repurchase of common stock for tax withholding	(194)	(110)
Payment of long-term debt − related party	0	(12,500)
Other	381	369
Net cash provided by (used in) financing activities	45,224	(12,183)
Net change in cash, cash equivalents and restricted cash	(66,941)	31,392
Cash, cash equivalents and restricted cash at beginning of period	130,033	33,033
Cash, cash equivalents and restricted cash at end of period	63,092	64,425
Reconciliation of cash, cash equivalents and restricted cash:
Cash, cash equivalents and restricted cash at end of period	63,092	64,425
Less: restricted cash	(3,443)	(3,454)
Cash and cash equivalents at end of the period	59,649	60,971
Supplemental disclosures of cash flow information:
Cash paid for leases	6,614	6,421
Cash paid for income taxes	0	1,003
Cash paid for interest − related party	0	990
At-The-Market
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	24,370	0
Stock Purchase Agreement
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	$ 20,000	$ 0