Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income (loss)	$ (696)	$ 249
Changes in operating assets and liabilities:
Prepaid expenses and other assets	187	186
Accounts payable, accrued expenses and other	(86)	215
Net cash used in operating activities	(437)	(1,005)
Gain on sale of in process research and development	(50)	(2,139)
Stock-based compensation expense	208	484
Cash flows from investing activities
Proceeds from sale of in process research and development	50	2,450
Net cash provided by investing activities	50	2,450
Cash flows from financing activities
Proceeds from exercise of stock options	239
Net cash provided by financing activities	239
Net (decrease) increase in cash and cash equivalents	(148)	1,445
Cash and cash equivalents, beginning of period	14,038	16,580
Cash and cash equivalents, end of period	$ 13,890	$ 18,025