Earnings Per Share - (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net loss	$ (3,799)	$ (2,978)	$ (14,421)	$ (7,278)
Denominator:
Weighted average common shares outstanding	23,212	22,989	23,152	22,963
Effect of dilutive securities:
Outstanding common stock equivalents	0	0	0	0
Denominator for diluted earnings per share	23,212	22,989	23,152	22,963
Basic loss per share	$ (0.16)	$ (0.13)	$ (0.62)	$ (0.32)
Diluted loss per share	$ (0.16)	$ (0.13)	$ (0.62)	$ (0.32)
Excluded outstanding shared-based awards having an anti-dilutive effect	1,083	916	1,083	916
Convertible Debt Securities
Effect of dilutive securities:
Excluded outstanding shared-based awards having an anti-dilutive effect	2,265	651	2,208	438