CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' DEFICIT - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Treasury Stock	Total
Balance at Dec. 31, 2017	$ 365	$ 333,738	$ (1,686)	$ (359,772)	$ (696)	$ (28,051)
Balance (in shares) at Dec. 31, 2017	36,372					36,372,411
Increase (Decrease) in Shareholders' Equity
Net loss				(22,618)		$ (22,618)
Issuance of common stock upon vesting of restricted stock units	$ 4	(4)
Issuance of common stock upon vesting of restricted stock units (in shares)	372
Stock-based compensation expense		2,585				2,585
Cumulative effect of a change in accounting for revenue recognition (Note O) | ASU 2014-09				(759)		(759)
Effect of shares withheld to cover taxes		(2,150)				(2,150)
Total other comprehensive loss			(2,582)			(2,582)
Balance at Mar. 31, 2018	$ 369	$ 334,169	$ (4,268)	$ (383,149)	$ (696)	$ (53,575)
Balance (in shares) at Mar. 31, 2018	36,744					36,744,543