Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities:
Loss from continuing operations	$ (15,402)	$ (35,676)
Loss from discontinued operations, net of income taxes	(40)	(21)
Net loss	(15,442)	(35,697)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	73	65
Stock-based compensation	3,011	4,212
Non-cash lease expense	358	401
Other non-cash items	462	68
Loss on disposal of assets	3	0
Realized gain on sale of equity holdings	(645)	(2,856)
Unrealized loss on equity holdings	1,538	4,999
Changes in operating assets and liabilities:
Other receivables	387	(324)
Prepaid expenses and other current assets	(1,051)	670
Other assets	288	(36)
Accounts payable and other accrued liabilities	(9,944)	(1,681)
Accrued payroll and benefits	(5,338)	(4,408)
Other long-term liabilities	(3,996)	96
Net cash used in operating activities	(30,296)	(34,491)
Cash Flows From Investing Activities:
Proceeds from maturities of investments	805	49,823
Proceeds from sale of equity holdings	287	2,858
Purchases of investments	(625)	(15,964)
Purchases of property and equipment, net	(39)	(73)
Net cash provided by investing activities	428	36,644
Cash Flows From Financing Activities:
Issuance of common shares to Hanmi Pharmaceutical Co., Ltd.	20,000	0
Proceeds from sale of common stock under an at-the-market sales agreement, net	0	21,357
Net cash provided by financing activities	20,000	21,357
Effect of exchange rates on cash and cash equivalents	8	2
Net (decrease) increase in cash and cash equivalents	(9,860)	23,512
Cash and cash equivalents—beginning of period	88,539	46,009
Cash and cash equivalents—end of period	78,679	69,521
Supplemental disclosure of cash flow information:
Cash paid for facility and equipment under operating leases	584	620
Cash paid for income taxes	0	4
Noncash investing activities:
Additions of property and equipment that remain in accounts payable and other accrued liabilities	$ 0	$ 27