Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income (loss)	$ (759)	$ (696)	$ (1,163)	$ 249	$ (1,455)	$ (914)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Gain on sale of in process research and development					(50)	(2,139)
Stock-based compensation expense					301	948
Changes in operating assets and liabilities:
Prepaid expenses and other assets					1,784	(444)
Accounts payable, accrued expenses and other					2	(435)
Net cash provided by (used in) operating activities					582	(2,984)
Cash flows from investing activities
Proceeds from sale of in process research and development					50	2,139
Net cash provided by investing activities					50	2,139
Cash flows from financing activities
Proceeds from exercise of stock options					239
Net cash provided by financing activities					239
Net increase (decrease) in cash and cash equivalents					871	(845)
Cash and cash equivalents, beginning of period		$ 14,038		$ 16,580	14,038	16,580
Cash and cash equivalents, end of period	$ 14,909		$ 15,735		$ 14,909	$ 15,735