Income (Loss) per Share (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic and dilutive numerator:
Net income (loss)	$ 7,533	$ (3,008)	$ (6,647)	$ (665)	$ (2,521)	$ (5,379)	$ (1,180)	$ (1,619)	$ (2,787)	$ (10,699)	$ 11,862
Denominator:
Shares outstanding									44,961,000	41,957,000	38,705,000
Contingently issuable shares - vested RSUs											7,000
Weighted-average shares outstanding—basic	45,085	45,310	44,849	44,601	44,648	44,644	39,767	38,769	44,961,000	41,957,000	38,712,000
Net effect of dilutive securities:
Stock options											104,000
Contingently issuable shares – nonvested RSUs											67,000
Weighted-average shares outstanding—diluted	46,709	45,310	44,849	44,601	44,648	44,644	39,767	38,769	44,961,000	41,957,000	38,883,000
Net loss per share—basic (in Dollars per share)	$ 0.17	$ (0.07)	$ (0.15)	$ (0.01)	$ (0.06)	$ (0.12)	$ (0.03)	$ (0.04)	$ (0.06)	$ (0.25)	$ 0.31
Net loss per share—diluted (in Dollars per share)	$ 0.16	$ (0.07)	$ (0.15)	$ (0.01)	$ (0.06)	$ (0.12)	$ (0.03)	$ (0.04)	$ (0.06)	$ (0.25)	$ 0.31