Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Stockholders' Equity

Summary of stock option and restricted stock units activity

	Stock Options				Restricted Stock Units
	Number of Shares		Weighted Average Exercise Price		Number of Shares		Weighted Average Grant Date Fair Value
Options/RSUs outstanding as of December 31, 2014	3,250,852		$	6.40	864,634		$	3.68
Granted	377,786		$	10.33	229,092		$	10.34
Cancelled/Forfeited	(22,871	)	$	15.16	(3,500	)	$	8.61
Exercised/Vested	(25,616	)	$	4.43	(358,115	)	$	3.12
Options/RSUs outstanding as of March 31, 2015	3,580,151		$	6.77	732,111		$	6.66