Stock Option Plan (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Stock Options Outstanding and Exercisable by Exercise Price

The stock options outstanding and exercisable by exercise price at March 31, 2019 are as follows:

		Options Outstanding						Options Vested and Exercisable
Exercise Price		Number Outstanding		Weighted- Average Remaining Contractual Life (Years)		Weighted- Average Exercise Price		Number Exercisable		Weighted- Average Exercise Price
$	0.16		64,950		4.8	$	0.16		64,950	$	0.16
$	0.37		180,088		6.2	$	0.37		71,413	$	0.37
$	0.97		150,084		7.0	$	0.97		65,684	$	0.97
$	2.51		179,945		7.4	$	2.51		70,085	$	2.51
$	2.89		49,000		7.9	$	2.89		16,750	$	2.89
$	2.93		334,002		8.1	$	2.93		122,172	$	2.93
$	3.18		135,200		8.3	$	3.18		42,115	$	3.18
			1,093,269		7.4	$	2.03		453,169	$	1.80

Summary of Restricted Stock Units Activity

The Company’s restricted stock units activity is summarized as follows:

	Units Issued and Outstanding			Weighted-Average Grant Date Fair Value
As of December 31, 2018		255,500		$	11.53
Granted		30,000		$	7.97
Released		(14,200	)	$	14.26
Canceled		(5,000	)	$	9.97
As of March 31, 2019		266,300		$	11.01

2012 Stock Option Plan

Summary of Stock Award and Option Activity Under Stock Incentive Plan

The Company’s stock award activity under the stock incentive plan is summarized as follows:

	Awards Available for Grant
As of December 31, 2018		4,434,310
Authorized		691,431
Granted		(30,000	)
Canceled		5,000
As of March 31, 2019		5,100,741

The Company’s stock option activity under the stock incentive plan is summarized as follows:

	Options Issued and Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
As of December 31, 2018		1,139,935		$	2.01		7.6	$	3,428
Granted		—		$	—
Exercised (1)		(46,666	)	$	1.38
Canceled		—		$	—
As of March 31, 2019		1,093,269		$	2.03		7.4	$	5,211
Options vested and expected to vest as of March 31, 2019		1,093,269		$	2.03		7.4	$	5,211
Options vested and exercisable as of March 31, 2019		453,169		$	1.80		7.1	$	2,265

(1) Includes vesting of early-exercised options.