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Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Option, Unvested RSU Activity and Related Information (Detail)

The following table summarizes option and unvested RSU activity under the plans and related information:

		Shares Available for Grant				Stock Options Outstanding				Weighted- Average Exercise Price				Number of RSU Shares				Weighted- Average Grant Date Fair Value
Balance—December 31, 2013			332,995				466,965			$	1.99				—			$	—
Additional options authorized			940,884				—				—				—				—
Restricted stock grants			(4,899	)			—				—				—				—
Options granted			(585,345	)			585,345				11.76				—				—
Assumed in business combination			—				23,229				2.06				—				—
Options exercised			—				(9,363	)			2.14				—				—
Options forfeited			20,591				(20,591	)			10.36				—				—
Options expired			13,781				(13,781	)			2.74				—				—
Balance—December 31, 2014			718,007				1,031,804				7.36				—				—
Additional options authorized			357,075				—				—				—				—
Restricted stock grants			(38,121	)			—				—				—				—
RSUs granted			(114,400	)			—				—				114,400				6.49
Options granted			(652,078	)			652,078				6.09				—				—
Options exercised			—				(23,576	)			1.94				—				—
RSUs forfeited			8,200				—				—				(8,200	)			6.49
Options forfeited			77,660				(77,660	)			8.13				—				—
Options expired			5,329				(5,329	)			10.36				—				—
Balance—December 31, 2015			361,672				1,577,317				6.87				106,200				6.49
Additional options authorized			512,575				—				—				—				—
Restricted stock grants			(61,921	)			—				—				—				—
RSUs granted			(287,900	)			—				—				287,900				5.50
Options granted			(597,470	)			597,470				4.91				—				—
Options exercised			—				(5,688	)			3.29				—				—
RSUs forfeited			61,305				—				—				(61,305	)			5.81
RSUs vested			—				—				—				(26,550	)			6.49
Options forfeited			269,212				(269,212	)			6.64				—				—
Options expired			107,601				(107,601	)			8.88				—				—
Balance—December 31, 2016			365,074				1,792,286			$	6.15				306,245			$	5.69
Vested at December 31, 2016							990,371			$	6.05
Vested and expected to vest at December 31, 2016							1,757,309			$	6.15

Schedule of Options Outstanding and Options Vested

Options outstanding and options vested as of December 31, 2016 are summarized as follows:

		Options Outstanding												Options Vested
Range of Exercise Prices		Number of Options Outstanding				Weighted Average Remaining Contractual Life (Years)				Weighted Average Exercise Price				Number of Options Vested				Weighted Average Exercise Price
$0.27 - 3.98			448,109				5.05			$	2.04				415,570			$	1.92
$4.37 - 4.60			179,263				9.15				4.47				18,064				4.46
$4.95 - 5.85			397,018				9.09				5.22				88,627				5.31
$6.49 - 7.03			384,910				8.18				6.64				189,136				6.64
$10.00 - 12.44			382,986				7.32				12.20				278,974				12.14
			1,792,286				7.51			$	6.14				990,371			$	6.05

Summary of Options Outstanding and Exercisable Vested or Expected to Vest

Options outstanding that have vested and are expected to vest at December 31, 2016 are as follows:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value (In thousands)
Vested			990,371			$	6.05				6.55			$	427
Expected to Vest			766,938				6.28				8.70				—
Total			1,757,309			$	6.15				7.49			$	427

Weighted-Average Assumptions Used to Fair Value of Share-Based Awards

The fair value of employee stock options and ESPP was estimated using the Black-Scholes Model using the following weighted-average assumptions.

		Year Ended December 31,
		2016					2015					2014
Employee Stock Options
Expected term (in years)			5.9					6.0					5.1
Expected volatility			42.10		%		41.17			%		42.18			%
Risk-free interest rate			1.52		%		1.84			%		1.69			%
Expected dividend yield		—			%		—			%		—			%
Employee Stock Purchase Plan
Expected term (in years)			0.5					0.5					—
Expected volatility		77.05 – 90.81			%		39.10 – 44.15			%			—
Risk-free interest rate		0.37 – 0.49			%			0.11		%			—
Expected dividend yield		—			%		—			%		—			%

Summary of Expense Relating to Employee and Nonemployee Stock-Based Payment Awards from Stock Options and RSUs

The following table summarizes stock-based compensation expense relating to employee and nonemployee stock options, RSUs, and ESPP for the years ended December 31, 2016, 2015 and 2014, included in the statements of operations as follows (in thousands):

		Year Ended December 31,
		2016				2015				2014
Cost of testing		$	144			$	109			$	28
Research and development			449				247				88
Sales and marketing			156				173				29
General and administrative			1,249				812				390
		$	1,998			$	1,341			$	535

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