Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (3,028)	$ (17,332)
Income from discontinued operations		3,935
Loss from continuing operations	(3,028)	(21,267)
Adjustments to reconcile net loss to net cash used in operating activities
Non-cash interest expense		141
Amortization and accretion on marketable securities		(292)
Loss on extinguishment of debt		971
Benefit from intra-period tax allocation		(1,500)
Gain on sale of property and equipment		(1,984)
Gain on sale of in-process research and development asset	(2,139)	(3,500)
Depreciation and amortization expense		2,228
Stock-based compensation expense	1,722	2,371
Gain on equity method investment		(372)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	764	3,917
Accounts payable, accrued expenses and other	(1,944)	(12,081)
Net cash used in operating activities	(4,625)	(31,368)
Cash flows from investing activities
Proceeds from sales and maturities of marketable securities		51,500
Proceeds from sale of in-process research and development asset	2,139	3,500
Proceeds from sale of equity method investment		7,800
Proceeds from sale of property and equipment		2,025
Proceeds from sale of a discontinued operation		5,000
Net cash provided by investing activities	2,139	69,825
Cash flows from financing activities
Proceeds from exercise of options		145
Repayment of debt		(15,000)
Repayment of other liability	56
Payment of debt extinguishment costs		(985)
Payment of dividends		(26,700)
Net cash used in financing activities	(56)	(42,540)
Net decrease in cash, cash equivalents and restricted cash	(2,542)	(4,083)
Cash, cash equivalents and restricted cash, beginning of period	16,580	20,663
Cash and cash equivalents, end of period	14,038	16,580
Supplemental disclosure of cash flows
Cash paid for interest	$ 3	$ 1,400