Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Series C Convertible Preferred Stock	Series D Convertible Preferred Stock	Common Stock and Additional Paid-in Capital	Common Stock and Additional Paid-in Capital Series C Convertible Preferred Stock	Common Stock and Additional Paid-in Capital Series D Convertible Preferred Stock	Convertible Preferred Stock Series C Convertible Preferred Stock	Convertible Preferred Stock Series D Convertible Preferred Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2015	$ 24,925			$ 188,680					$ (801)	$ (162,954)
Balance, shares at Dec. 31, 2015				11,646,000
Exercise of stock options, net	1			$ 1
Stock-based compensation	3,065			$ 3,065
Issuance of stock from RSUs, net				98,000
Issuance of participating convertible preferred stock and warrants, net of issuance cost		$ 1,092			$ 1,092		$ 8,428
Issuance of participating convertible preferred stock and warrants, shares							88,000
Beneficial conversion feature of participating convertible preferred stock		1,092			1,092		$ (1,092)
Deemed dividend related to beneficial conversion feature of participating convertible preferred stock	(2,184)	(2,184)			(2,184)		2,184
Issuance of common stock upon conversion of participating convertible preferred stock, value		$ 9,520			$ 9,520		$ (9,520)
Issuance of common stock upon conversion of participating convertible preferred stock, shares					1,769,000		(88,000)
Net loss	(15,371)									(15,371)
Foreign currency translation adjustment	(75)								(75)
Balance at Dec. 31, 2016	22,065			$ 201,266					(876)	(178,325)
Balance, shares at Dec. 31, 2016				13,513,000
Exercise of stock options, net	3			$ 3
Stock-based compensation	2,145			$ 2,145
Issuance of stock from RSUs, net				81,000
Issuance of participating convertible preferred stock and warrants, net of issuance cost			$ 2,026			$ 2,026		$ 8,214
Issuance of participating convertible preferred stock and warrants, shares								81,000
Beneficial conversion feature of participating convertible preferred stock			1,952			1,952		$ (1,952)
Deemed dividend related to beneficial conversion feature of participating convertible preferred stock	(3,978)		(3,978)			(3,978)		3,978
Issuance of common stock upon conversion of participating convertible preferred stock, value			$ 10,240			$ 10,240		$ (10,240)
Issuance of common stock upon conversion of participating convertible preferred stock, shares						1,613,000		(81,000)
Issuance of stock from rights offering, net	11,358			$ 11,358
Issuance of stock from rights offering, net, shares				5,261,000
Net loss	(16,851)									(16,851)
Foreign currency translation adjustment	300								300
Balance at Dec. 31, 2017	$ 29,260			$ 225,012					(576)	(195,176)
Balance, shares at Dec. 31, 2017	20,468,000			20,468,000
Exercise of stock options, net	$ 3			$ 3
Exercise of stock options, net, shares	1,000			1,000
Fees for rights offering	$ (38)			$ (38)
Stock-based compensation	2,627			$ 2,627
Issuance of stock from RSUs, net				603,000
Warrant issued in connection with debt instruments	847			$ 847
Net loss	(21,516)									(21,516)
Foreign currency translation adjustment	(94)								(94)
Balance at Dec. 31, 2018	$ 11,089			$ 228,451					$ (670)	$ (216,692)
Balance, shares at Dec. 31, 2018	21,072,491			21,072,000