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Loss per Share - Computation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss	$ (4,185)	$ (4,001)	$ (4,733)	$ (6,200)	$ (4,845)	$ (3,826)	$ (12,919)	$ (14,871)
Denominator:
Weighted-average common shares, basic	26,007			25,598			26,004	22,969
Incremental dilutive shares								0
Weighted-average common shares, dilutive	26,007			25,598			26,004	22,969
Net loss per share, basic and diluted	$ (0.16)			$ (0.24)			$ (0.50)	$ (0.64)
Warrants
Denominator:
Dilutive effect of stock options								0
Options
Denominator:
Dilutive effect of stock options								0

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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