Net Loss Per Share - Computation of basic and diluted net loss per share (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
Earnings Per Share [Abstract]
Net loss	$ (11,019)	$ (12,414)	$ (7,283)	$ (8,418)	$ (23,433)	$ (15,701)
Weighted average common shares outstanding, basic (in shares)	91,016		98,810		93,457	98,696
Continuing operations (in dollars per share)	$ (0.12)		$ (0.07)		$ (0.25)	$ (0.16)
Discontinuing operations, basic (in dollars per share)	$ 0		$ 0		$ 0	$ 0
Net loss from continuing operations	$ (11,019)		$ (7,115)		$ (23,433)	$ (15,533)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0		$ (168)		$ 0	$ (168)