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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ 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
Earnings Per Share [Abstract]
Net loss	$ (3,050)	$ (2,363)	$ (2,874)	$ (1,691)	$ (5,413)	$ (4,565)
Cumulative dividends on convertible preferred stock	(715)		(304)		(1,421)	(564)
Net loss attributable to common stockholders	$ (3,765)		$ (3,178)		$ (6,834)	$ (5,129)
Net loss per share attributable to common stockholders – basic and diluted	$ (1.00)		$ (0.92)		$ (1.82)	$ (1.52)
Weighted-average number of shares used in computing net loss per common share, basic and diluted	3,764,488		3,462,182		3,764,488	3,383,774

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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