Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities:
Loss from continuing operations	$ (72,846)	$ (68,629)
Income from discontinued operations, net of income taxes (Note 10)	189	20,975
Net loss	(72,657)	(47,654)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	282	1,400
Stock-based compensation (Note 4)	9,263	13,019
Recognized gain on Commercial Product Portfolio Transaction (Note 10)	0	(33,644)
Non-cash lease expense (Note 8(a))	765	874
Unrealized gain on investments in debt securities and bank CDs (Note 3(a))	0	133
Amortization of discount on investments in debt securities (Note 3(a))	23	(331)
Realized gain on mutual funds	(118)	0
Income tax recognition on unrealized gain on available-for-sale securities	0	(33)
Realized gain on sale of equity holdings (Note 7)	(542)	(2,674)
Unrealized loss on equity holdings (Note 3(a) and Note 7)	6,622	11,758
Unrealized loss (gain) from transactions denominated in foreign currency	508	(5)
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	27,314
Other receivables	3,257	(6,535)
Inventories	0	(2,037)
Prepaid expenses and other current assets	(945)	(3,164)
Other assets	401	(1,087)
Accounts payable and other accrued liabilities	(3,277)	(33,334)
Accrued payroll and benefits	(1,812)	(4,592)
FOLOTYN development liability	0	(4)
Contract liabilities	0	2,395
Other long-term liabilities	(2,162)	1,843
Net cash used in operating activities	(60,392)	(76,349)
Cash Flows From Investing Activities:
Proceeds from Commercial Product Portfolio Transaction (Note 1(b))	0	158,765
Proceeds from maturities of marketable securities	88,263	0
Proceeds from sale of equity holdings (Note 7)	1,843	5,074
Proceeds from sale of mutual funds	2,380	0
Purchases of marketable securities (Note 3(a))	(8,998)	(127,564)
Purchases of mutual funds	(1,580)	0
Purchases of property and equipment, net (Note 3(b))	(4,066)	(1,241)
Net cash provided by investing activities	77,842	35,034
Cash Flows From Financing Activities:
Proceeds from employees for exercises of stock options	0	3,854
Proceeds from sale of common stock under an at-the-market sales agreement (Note 12)	3,071	1,814
Proceeds from sale of stock under our employee stock purchase plan	282	444
Net cash provided by financing activities	3,353	6,112
Effect of exchange rates on cash, cash equivalents and restricted cash	(95)	(6)
Net increase (decrease) in cash, cash equivalents and restricted cash	20,708	(35,209)
Cash, cash equivalents and restricted cash—beginning of period	64,418	157,480
Cash, cash equivalents and restricted cash—end of period	85,126	122,271
Supplemental disclosure of cash flow information:
Cash paid for facility and equipment under operating leases	1,201	921
Cash paid for income taxes	14	33
Noncash investing activities:
Additions of property and equipment that remain in accounts payable and other accrued liabilities (Note 3(b))	$ 324	$ 3,209