Consolidated Statements Of Redeemable Preferred Stock and Stockholders' (Deficit) Equity (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Preferred Stock	Common Stock and Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance at Dec. 31, 2018			$ 228,451	$ (670)	$ (216,692)
Issuance of common stock upon exercise of options			3
Settlement of liability awards			202
Stock-based compensation expense			634
Other comprehensive loss				(55)
Net loss	$ (4,900)				(4,900)
Ending balance at Mar. 31, 2019	6,973		229,290	(725)	(221,592)
Total redeemable preferred stock, beginning balance at Dec. 31, 2019	3,965	$ 3,965
Issuance of Redeemable preferred stock
Total redeemable preferred stock, ending balance at Mar. 31, 2020	3,965	$ 3,965
Beginning balance at Dec. 31, 2019	377		235,625	(701)	(234,547)
Settlement of liability awards			151
Stock-based compensation expense			640
Other comprehensive loss				(18)
Net loss	(6,006)				(6,006)
Ending balance at Mar. 31, 2020	$ (4,856)		$ 236,416	$ (719)	$ (240,553)