Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows used in operating activities:
Net loss	$ (28,361)	$ (34,780)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation expense	6,215	6,251
Depreciation and amortization expense	448	545
Reduction in carrying amount of right-of-use asset	1,579	1,517
Net (accretion) amortization of (discounts) premiums on marketable securities	(1,265)	(646)
Amortization of debt discount − related party	0	176
Other	(91)	32
Changes in operating assets and liabilities:
Accounts receivable	(1,799)	945
Prepaid expenses and other current and long-term assets	(4,670)	498
Accounts payable	182	(138)
Accrued expenses and other current liabilities	(7,663)	(3,670)
Operating lease liability	(1,256)	(1,124)
Deferred revenue	18,563	(2,731)
Net cash used in operating activities	(18,118)	(33,125)
Cash flows (used in) provided by investing activities:
Proceeds from maturities of marketable securities	54,352	65,557
Purchases of marketable securities	(107,748)	(11,437)
Purchases of property and equipment, net	0	(589)
Net cash (used in) provided by investing activities	(53,396)	53,531
Cash flows provided by (used in) financing activities:
Proceeds from exercise of stock options	519	56
Payments for repurchase of common stock for tax withholding	(109)	(94)
Payment of long-term debt − related party	0	(750)
Other	84	104
Net cash provided by (used in) financing activities	34,583	(684)
Net change in cash, cash equivalents and restricted cash	(36,931)	19,722
Cash, cash equivalents and restricted cash at beginning of period	130,033	33,033
Cash, cash equivalents and restricted cash at end of period	93,102	52,755
Reconciliation of cash, cash equivalents and restricted cash:
Cash, cash equivalents and restricted cash at end of period	93,102	52,755
Less: restricted cash	(3,443)	(3,279)
Cash and cash equivalents at end of the period	89,659	49,476
Supplemental disclosures of cash flow information:
Cash paid for leases	2,184	2,120
Cash paid for interest − related party	0	430
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures in accounts payable and accrued expenses	0	196
Stock Purchase Agreement
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	20,000	0
At-The-Market
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	$ 14,089	$ 0