Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities:
Loss from continuing operations	$ (40,617)	$ (39,846)
Income from discontinued operations, net of income taxes (Note 10)	45	20,587
Net loss	(40,572)	(19,259)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	140	1,331
Stock-based compensation (Note 4)	5,275	8,000
Recognized gain on Commercial Product Portfolio Transaction (Note 10)	0	(33,644)
Amortization of operating leases (Note 8(a))	381	509
Amortization of discount on investments in debt securities, recorded to interest income (Note 3(a))	(29)	0
Realized gain on mutual funds	(189)	0
Unrealized loss on CASI stock holdings (Note 3(a) and Note 7)	10,238	12,183
Unrealized gain from transactions denominated in foreign currency	(22)	(1)
Change in deferred tax liabilities	0	(1,469)
Change in fair value of contingent consideration (Note 8(b))	0	1,478
Changes in operating assets and liabilities:
Accounts receivable, net	0	14,914
Other receivables	762	(3,776)
Inventories	0	(2,037)
Prepaid expenses and other assets	(960)	512
Other assets	823	(980)
Accounts payable and other accrued liabilities	(3,919)	(14,151)
Accrued payroll and benefits	(3,118)	(4,685)
FOLOTYN development liability	0	(4)
Other long-term liabilities	(2,153)	1,024
Net cash used in operating activities	(33,343)	(40,055)
Cash Flows From Investing Activities:
Proceeds from Commercial Product Portfolio Transaction (Note 1(b))	0	158,765
Proceeds from maturities of marketable securities	50,133	0
Proceeds from sale of mutual funds	833	0
Purchases of investment securities available-for-sale (Note 3(a))	(8,998)	0
Purchases of mutual funds	(1,210)	0
Purchases of property and equipment (Note 3(b))	(1,395)	(314)
Net cash provided by investing activities	39,363	158,451
Cash Flows From Financing Activities:
Proceeds from employees for exercises of stock options	0	831
Net cash provided by financing activities	0	831
Effect of exchange rates on cash, cash equivalents and restricted cash	(86)	(55)
Net increase in cash, cash equivalents and restricted cash	5,934	119,172
Cash, cash equivalents and restricted cash—beginning of period	64,418	157,480
Cash, cash equivalents and restricted cash—end of period	70,352	276,652
Supplemental disclosure of cash flow information:
Cash paid for facility and equipment under operating leases	593	471
Cash paid for income taxes	0	33
Noncash investing activities:
Additions of property and equipment that remain in accounts payable and other accrued liabilities (Note 3(b))	$ 2,772	$ 0