Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (1,006)	$ (705)	$ (1,920)	$ (20,593)
Adjustments to reconcile net loss to net cash used in operating activities
Non-cash interest expense				141
Loss on extinguishment of debt				971
Depreciation and amortization expense				2,228
Gain on sale of equipment				(1,984)
Gain on sale of in progress research and development			(2,139)	(3,500)
Amortization and accretion on marketable securities				(292)
Stock-based compensation expense	400	703	1,348	1,784
Gain on equity method investment				(372)
Changes in operating assets and liabilities:
Prepaid expenses and other assets			358	3,001
Accounts payable, accrued expenses and other			(496)	(10,112)
Net cash used in operating activities			(2,849)	(28,728)
Cash flows from investing activities
Proceeds from sale of property and equipment				2,025
Proceeds from sale of in progress research and development			2,139	3,500
Proceeds from sale of equity method investment				7,800
Proceeds from maturities and sales of marketable securities				51,500
Net cash provided by investing activities			2,139	64,825
Cash flows from financing activities
Proceeds from exercise of stock options				83
Repayment of other liability			(56)
Repayment of debt				(15,000)
Payment of debt extinguishment costs				(985)
Payment of dividend				(20,000)
Net cash used in financing activities			(56)	(35,902)
Net (decrease) increase in cash, cash equivalents and restricted cash			(766)	195
Cash, cash equivalents and restricted cash, beginning of period			16,580	20,663
Cash, cash equivalents and restricted cash, end of period	$ 15,814	$ 20,858	$ 15,814	20,858
Supplemental disclosure of cash flows
Cash paid for interest				$ 1,399