Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of option activity

						Weighted average
				Weighted		remaining
				average		contractual
	Option Shares			exercise price		term (year)
Balances at December 31, 2016		2,786,977		$	7.27		6.28
Granted		90,000			8.50
Exercised		(289,931	)		2.68
Forfeited		(212,357	)		11.58
Balances at March 31, 2017		2,374,689		$	7.49		7.41

Summary of RSUs activity

				Weighted average
				grant date
	Number of shares			fair value
Balances at December 31, 2016		430,733		$	7.99
Granted		375,941			8.60
Vested		(115,295	)		8.40
Restricted stock units withheld for tax		46,420			8.44
Balances at March 31, 2017		737,799		$	8.27