Description of Business and Basis of Presentation (Details 1) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
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	897	413
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	361	323
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	825	0
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	7	0