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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net loss	$ (6,757)	$ (4,124)	$ (11,936)	$ (8,213)
Other comprehensive loss:
Unrealized gain (loss) on securities available-for-sale	57	0	(10)	0
Total comprehensive loss	(6,700)	(4,124)	(11,946)	(8,213)
Preferred stock dividend payable on Series A Convertible Preferred Stock	(6)	(6)	(12)	(12)
Comprehensive loss attributable to common stockholders	(6,706)	(7,397)	(11,958)	(11,492)
Series D Convertible Preferred Stock
Other comprehensive loss:
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance	0	(602)	0	(602)
Series E Convertible Preferred Stock
Other comprehensive loss:
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance	$ 0	$ (2,665)	$ 0	$ (2,665)

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