UNAUDITED 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	$ (74,123)	$ (87,021)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	10,155	10,515
Stock-based compensation	14,384	8,237
Goodwill impairment	0	21,335
Accretion of discount on short-term investments	(2,961)	(2,275)
Other	1,320	(479)
Changes in operating assets and liabilities:
Receivables under development arrangements	739	723
Prepaid expenses and other current assets	(992)	1,460
Operating lease right-of-use assets and liabilities	(635)	(635)
Other long-term assets	(72)	(255)
Accounts payable	161	(380)
Accrued expenses and other liabilities	(1,055)	(839)
Deferred revenue	(2,359)	(100)
Net cash used in operating activities	(55,438)	(49,714)
Cash Flows From Investing Activities
Purchases of property and equipment	(381)	(843)
Investment in short-term investments	(159,483)	(122,196)
Proceeds from maturities of short-term investments	99,000	185,897
Proceeds from sales of property and equipment	244	128
Net cash (used in) provided by investing activities	(60,620)	62,986
Cash Flows From Financing Activities
Principal payments on long-term debt	(2,489)	(2,168)
Principal payments on finance lease obligations	(578)	(1,805)
Proceeds from issuance of common stock, net of issuance costs	84,607	725
Net cash provided by (used in) financing activities	81,540	(3,248)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(34,518)	10,024
Cash, cash equivalents and restricted cash - Beginning of year	89,667	76,842
Cash, cash equivalents, and restricted cash - End of period	55,149	86,866
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Right-of-use assets obtained in exchange for operating lease obligation	433	0
Property and equipment purchases included in accounts payable	$ 8	$ 0