Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of option activity

The following summarizes all option activity under the 2007 Plan, 2014 Plan and Inducement Plan:

				Weighted		Weighted average
				average		remaining
	Option			exercise		contractual
	Shares			price		term (year)
Balances at December 31, 2017		2,179,787		$	7.60		7.27
Granted		—			—
Exercised		(147,463	)		7.79
Forfeited		(78,990	)		11.68
Balances at December 31, 2018		1,953,334			7.42		6.30
Granted		—			—
Exercised		(51,451	)		2.44
Forfeited		(21,037	)		19.39
Balances at December 31, 2019		1,880,846		$	7.42		5.48
Vested and expected to vest at December 31, 2019		1,880,846
Vested and exercisable at December 31, 2019		1,794,439					5.74

Summary of RSUs activity

Activity related to RSUs is set forth below:

				Weighted average
	Number			grant date
	of shares			fair value
Balances at December 31, 2017		928,552		$	9.12
Granted		1,932,840			14.38
Vested		(523,257	)		10.40
Forfeited		(196,785	)		12.26
Balances at December 31, 2018		2,141,350		$	13.27
Granted		1,407,768			8.02
Vested		(944,467	)		10.56
Forfeited		(371,695	)		7.99
Balances at December 31, 2019		2,232,956		$	11.99