CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ 63,016	$ (31,573)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	676	4,181
Noncash lease expense	655	569
Loss from equity method investment	1,952
Stock-based compensation expense	7,194	8,356
(Amortization of premium) accretion of discount on short-term investments	(91)	414
Loss on disposal of property and equipment		6
Gain on sale of business	(131,249)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(6,088)	(2,511)
Accounts payable	1,637	991
Accrued expenses and other liabilities	1,646	(2,106)
Accrued income taxes	862
Deferred revenue	(1,604)	(31,008)
Operating lease liabilities	(136)	(1,253)
Net cash used in operating activities	(61,530)	(53,934)
Cash flows from investing activities:
Purchases of short-term investments	(49,248)	(97,392)
Maturities of short-term investments	47,461
Proceeds from sale of business	130,000
Purchases of property and equipment	(1,270)	(1,581)
Net cash provided by (used in) investing activities	126,943	(98,973)
Cash flows from financing activities:
Proceeds from issuance of common stock in follow-on public offering, net of discounts and issuance costs		49,744
Proceeds From Issuance Of Common Stock Pursuant To ATM Financing Net Of Discounts And Issuance Costs		1,454
Proceeds from issuance of common stock pursuant to employee stock purchase plan	439	446
Proceeds from issuance of common stock from option exercises	1	145
Net cash provided by financing activities	440	51,789
Net change in cash, cash equivalents and restricted cash	65,853	(101,118)
Cash, cash equivalents and restricted cash, beginning of period	110,335	218,705
Cash, cash equivalents and restricted cash, end of period	176,188	117,587
Supplemental disclosures of noncash investing and financing activities:
Reclassification of liability for common stock vested		8
Property and equipment additions included in accounts payable		94
Property and equipment additions included in accrued expenses and other liabilities	5
Unrealized gain (loss) on available for sale securities, net	$ (34)	$ 2