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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,179)	$ (4,089)
Other comprehensive loss:
Unrealized loss on securities available-for-sale	(67)	0
Total comprehensive loss	(5,246)	(4,089)
Preferred stock dividend payable on Series A Convertible Preferred Stock	(6)	(6)
Comprehensive loss attributable to common stockholders	$ (5,252)	$ (4,095)

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