Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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	(14,529)		3.94
Forfeited	(41,926)		15.25
Balances at June 30, 2016	3,000,970	$	6.51	6.38

Summary of RSUs activity

		Weighted average
		grant date
	Number of shares	fair value
Balances at December 31, 2015	17,993	$	3.88
Granted	557,240		8.21
Vested	(2,250)		3.88
Balances at June 30, 2016	572,983	$	8.09