Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Stock Option Activity

		Options Outstanding
			Weighted-		Weighted-
	Options and		Average		Average
	Awards		Exercise		Remaining	Aggregate
	Available for	Number of	Price Per		Contractual	Intrinsic
	Grant	Options	Share		Life (years)	Value
						(In thousands)
Balance—December 31, 2017	83,929	1,593,195	$	8.88	6.6	$	1,997
Immaterial prior period adjustment	(1,026)	11,477		4.84
Authorized	1,084,516	—		—
RSUs granted	(80,950)	—		—
RSUs cancelled/forfeited	3,000	—		—
Options granted	(434,665)	434,665		8.52
Options exercised	—	(448,411)		4.99		$	1,915
Options cancelled/forfeited	109,341	(115,627)		8.68
Balance—December 31, 2018	764,145	1,475,299	$	7.60	7.8	$	284
Options exercisable—December 31, 2018		617,718	$	6.79	6.4	$	276

Schedule of Restricted Stock Unit Activity

	RSUs Outstanding
		Weighted-
		Average
	Number of	Grant Date
	Restricted Stock	Fair Value Per
	Units	Share
Balance—December 31, 2017	30,680	$	10.55
Granted	80,950		8.48
Vested	(15,070)		13.41
Cancelled/forfeited	(3,000)		8.10
Balance—December 31, 2018	93,560	$	8.38

Summary of Stock-Based Compensation Expense

The Company recognized stock-based compensation expense from awards granted to employees and non-employees under its equity incentive plans and from its ESPP as follows, excluding amounts related to GLOBALFOUNDRIES, Inc. (GF) (in thousands):

	Year Ended December 31,
	2018		2017
Research and development	$	492	$	488
General and administrative		1,811		1,297
Sales and marketing		365		263
Total	$	2,668	$	2,048

2016 Employee Stock Purchase Plan [Member]

Schedule of Fair Value Assumptions

	Year Ended December 31,
	2018		2017
Expected volatility	59.5 – 87.8	%	49.3 – 72.7	%
Risk-free interest rate	0.94 – 2.11	%	0.49 – 1.02	%
Expected term (in years)	0.5 – 1.0		0.5 – 1.0
Dividend yield	—	%	—	%

Employees [Member]

Schedule of Fair Value Assumptions

	Year Ended December 31,
	2018		2017
Expected volatility	51.9 – 56.6	%	46.7 – 52.0	%
Risk-free interest rate	2.64 - 2.94	%	1.85 - 2.14	%
Expected term (in years)	5.7 – 6.1		5.3 – 6.1
Dividend yield	—	%	—	%

Non-Employee [Member]

Schedule of Fair Value Assumptions

	Year Ended December 31,
	2018		2017
Expected volatility	52.9 – 54.8	%	46.7 – 60.5	%
Risk-free interest rate	2.68 - 2.97	%	2.09 – 2.44	%
Expected term (in years)	8.0 – 8.8		7.2 – 9.6
Dividend yield	—	%	—	%