Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Stockholders' Equity

Summary of option activity

				Weighted average
		Weighted		remaining
		average		contractual
	Option Shares	exercise price		term (year)
Balances at December 31, 2015	2,785,672	$	6.66	6.60
Granted	271,753		6.14
Exercised	(5,979)		3.99
Forfeited	(23,577)		15.02
Balances at March 31, 2016	3,027,869	$	6.56	6.64

Summary of RSUs activity

		Weighted average
		grant date
	Number of shares	fair value
Balances at December 31, 2015	17,993	$	3.88
Granted	482,500		8.44
Vested	(1,125)		3.88
Balances at March 31, 2016	499,368	$	8.29