CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]
Balance (in shares) at Dec. 31, 2012		13,358
Balance at Dec. 31, 2012	$ 92,524	$ 13	$ 136,451	$ (43,196)	$ (744)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,429		5,429
Restricted stock vesting (in shares)		183
Restricted stock vesting	0	$ 0	0
Restricted stock grants (in shares)		166
Restricted stock grants, net of cancellations	0	$ 0	0
Stock options exercised (in shares)		17
Stock options exercised	224	$ 0	224
Conversion of convertible debt (in shares)		608
Conversion of convertible debt	10,592	$ 1	10,591
Other treasury share purchases (in shares)		(296)
Other treasury share purchases	(4,913)				(4,913)
Net (loss) income	(20,129)			(20,129)
Balance (in shares) at Dec. 31, 2013		14,036
Balance at Dec. 31, 2013	83,727	$ 14	152,695	(63,325)	(5,657)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3,655		3,655
Restricted stock vesting (in shares)		28
Restricted stock vesting	0	$ 0	0
Restricted stock grants (in shares)		169
Restricted stock grants, net of cancellations	1	$ 1	0
Stock options exercised (in shares)		27
Stock options exercised	0		377
Stock options exercised	377
Warrants exercised (in shares)		1
Warrants exercised	18	$ 0	18
Share repurchase program (in shares)		(200)
Share repurchase program	(4,824)	$ 0	0		(4,824)
Other treasury share purchases (in shares)		(83)
Other treasury share purchases	(2,056)				(2,056)
Net (loss) income	$ 20,582			20,582
Balance (in shares) at Dec. 31, 2014	13,978	13,978
Balance at Dec. 31, 2014	$ 101,480	$ 15	156,745	(42,743)	(12,537)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,824		5,824
Excess tax benefits from share-based compensation	4,952		4,952
Restricted stock vesting (in shares)		22
Restricted stock vesting	0	$ 0	0
Restricted stock grants (in shares)		200
Restricted stock grants, net of cancellations	$ 0	$ 0	0
Stock options exercised (in shares)	15	15
Stock options exercised		$ 0	315
Stock options exercised	$ 315
Warrants exercised (in shares)		359
Warrants exercised	18,091	$ 0	18,091
Other treasury share purchases (in shares)		(145)
Other treasury share purchases	(6,330)				(6,330)
Common stock issuance (in shares)		442
Common stock issuance	15,089	$ 1	15,088
Net (loss) income	$ (5,414)			(5,414)
Balance (in shares) at Dec. 31, 2015	14,871	14,871
Balance at Dec. 31, 2015	$ 134,007	$ 16	$ 201,015	$ (48,157)	$ (18,867)