Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Stock Option Activity

		Options Outstanding
			Weighted-		Weighted-
			Average		Average
	Options		Exercise		Remaining	Aggregate
	Available for	Number of	Price Per		Contractual	Intrinsic
	Grant	Options	Share		Life (years)	Value
						(In thousands)
Balance—December 31, 2014	106,468	852,639	$	4.42	8.0	$	-
Options authorized	24,956	—
Options granted	(123,830)	123,830		4.50
Options exercised	—	(1,558)		4.42		$	11
Options cancelled/forfeited	47,736	(47,736)		4.42
Balance—December 31, 2015	55,330	927,175		4.43	7.3	$	6,500
Options authorized	785,364	—
Options granted	(563,523)	563,523		13.20
Options exercised	—	(10,639)		4.43		$	114
Options cancelled/forfeited	65,329	(65,329)		4.71
Balance—December 31, 2016	342,500	1,414,730		5.28	7.6	$	4,267
Options exercisable—December 31, 2016		729,746		4.52	6.1	$	2,752
Options vested and expected to vest—December 31, 2016		1,414,732		5.28	7.6	$	4,267

Summary of Stock-Based Compensation Expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Research and development	$	403	$	169	$	304
General and administrative		637		190		392
Sales and marketing		101		57		103
Total	$	1,141	$	416	$	799

Employees

Schedule of Fair Value Assumptions of Stock Options

	Year Ended December 31,
	2016		2015		2014
Expected volatility	42.6 – 45.3	%	44.1 – 48.9	%	36.4 – 53.2	%
Risk-free interest rate	1.12 – 2.26	%	1.51 – 1.79	%	0.43 – 2.04	%
Expected term (in years)	4.8 – 6.1		5.6 – 6.1		2.1 – 6.1
Dividend yield	—	%	—	%	—	%

Non-Employee

Schedule of Fair Value Assumptions of Stock Options

	Year Ended December 31,
	2016		2015		2014
Expected volatility	52.3 - 52.7	%	51.6 - 52.9	%	52.8 - 53.8	%
Risk-free interest rate	1.94 - 2.41	%	1.72 - 2.02	%	2.17 - 2.48	%
Expected term (in years)	9.5 - 9.8		6.6 - 9.1		7.3 - 9.8
Dividend yield	—	%	—	%	—	%