Unaudited Condensed Consolidated Statements of Changes in Shareholders Deficit - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2017		18,701,935
Beginning balance at Dec. 31, 2017	$ 14,938	$ 551,925	$ 73,185	$ (713,974)	$ 103,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(32,828)			(32,828)
Foreign currency translation adjustment	655				655
Stock-based compensation expense	906		906
Vesting of restricted stock, net of shares withheld for taxes (in shares)		1,276
Vesting of restricted stock, net of shares withheld for taxes	(3)		(3)
Fair value allocated to warrants	3,277		3,277
Ending balance (in shares) at Mar. 31, 2018		18,703,211
Ending balance at Mar. 31, 2018	(13,055)	$ 551,925	77,365	(746,802)	104,457
Beginning balance (in shares) at Dec. 31, 2018		19,017,089
Beginning balance at Dec. 31, 2018	(88,860)	$ 552,506	79,295	(822,301)	101,640
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(31,847)			(31,847)
Foreign currency translation adjustment	1,122				1,122
Stock-based compensation expense	645		645
Vesting of restricted stock, net of shares withheld for taxes (in shares)		26,309
Vesting of restricted stock, net of shares withheld for taxes	(9)		(9)
Ending balance (in shares) at Mar. 31, 2019		19,043,398
Ending balance at Mar. 31, 2019	$ (118,949)	$ 552,506	$ 79,931	$ (854,148)	$ 102,762