Loss per Share - Computation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (5,072)	$ (3,696)	$ (4,001)	$ (4,733)	$ (8,768)	$ (8,734)
Denominator:
Weighted-average common shares, basic	26,052		26,003		26,067	26,003
Incremental dilutive shares						0
Weighted-average common shares, dilutive	26,052		26,003		26,067	26,003
Basic net loss per common share	$ (0.19)		$ (0.15)		$ (0.34)	$ (0.34)
Diluted net loss per common share	$ (0.19)		$ (0.15)		$ (0.34)	$ (0.34)
Warrants
Denominator:
Dilutive effect of stock options						0
Employee Options
Denominator:
Dilutive effect of stock options						0