CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ (96,842)	$ 29,290
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	578	997
Noncash lease expense	1,091	969
Loss from equity method investment	11,917	4,131
Stock-based compensation expense	6,477	9,965
Accretion of discount on short-term investments	(2,279)	(872)
Loss on disposal of property and equipment	68	0
Gain on sale of business	0	(131,249)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	2,966	(5,301)
Accounts payable	6,659	2,711
Accrued expenses and other liabilities	(2,996)	5,672
Deferred revenue	(1,156)	(2,406)
Operating lease liabilities	(1,138)	(369)
Net cash used in operating activities	(74,655)	(86,462)
Cash flows from investing activities:
Purchases of short-term investments	(73,240)	(157,460)
Maturities of short-term investments	142,740	47,461
Proceeds from sale of business	0	130,000
Proceeds from sale of property and equipment	338	0
Purchases of property and equipment	(228)	(1,276)
Net cash provided by investing activities	69,610	18,725
Cash flows from financing activities:
Proceeds from issuance of common stock pursuant to employee stock purchase plan	168	563
Proceeds from issuance of common stock from option exercises	2	1
Net cash provided by financing activities	170	564
Net change in cash, cash equivalents and restricted cash	(4,875)	(67,173)
Cash, cash equivalents and restricted cash, beginning of period	33,986	110,335
Cash, cash equivalents and restricted cash, end of period	29,111	43,162
Supplemental disclosures of noncash investing and financing activities:
Property and equipment additions included in accrued expenses and other liabilities	0	8
Unrealized loss on available for sale securities, net	$ 368	$ (450)