Description of Business and Basis of Presentation (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Outstanding options to purchase common stock
Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive
Anti-dilutive, shares	918	758	918	758
Unvested restricted stock awards
Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive
Anti-dilutive, shares	286	600	286	600
Unvested restricted stock unit awards
Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive
Anti-dilutive, shares	862	203	862	203
Employee stock purchase plan awards
Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive
Anti-dilutive, shares	24	0	24	0