Equity Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Option Activities under Its Equity Incentive Plans

During the three months ended March 31, 2017, the Company had the following option activities under its equity incentive plans:

				Outstanding Options
	Available for Grant			Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Balance at December 31, 2016		1,655,524			9,345,515		$	7.72
Shares authorized		1,900,000
Granted (1)		(1,660,466	)		1,458,200			6.71
Exercised (2)		40,208			(73,563	)		4.91
Forfeited and expired		119,685			(119,685	)		6.34
Balance at March 31, 2017		2,054,951			10,610,467		$	7.62		6.83	$	10,548,578

(1) The difference between shares granted in the number of shares available for grant and outstanding options represents the RSUs granted for the period.

(2) Shares presented as available for grant represents shares repurchased for tax withholding upon vesting of RSUs.

Restricted Stock Activity

During the three months ended March 31, 2017, the activity for restricted stock is summarized as follows:

	Shares			Weighted Average Grant-Date Fair Value
Balance at December 31, 2016		471,650		$	4.60
Granted		202,266			6.62
Vested		(77,265	)		3.66
Canceled		—			—
Unvested at March 31, 2017		596,651		$	5.40