Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Stock-Based Compensation

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, 2017	83,929	1,593,195	$	8.88	6.6	$	1,997
Prior period adjustment	(1,026)	13,784		4.54	0.3
Options authorized	384,516	—
RSUs granted	(36,350)	—
RSUs cancelled/forfeited	400	—
Options granted	(218,600)	218,600		9.12
Options exercised	—	(58,229)		5.31		$	200
Options cancelled/forfeited	—	(391)		6.63
Balance—March 31, 2018	212,869	1,766,959	$	7.04	7.0	$	1,949
Options exercisable—March 31, 2018		783,554	$	5.29	4.0	$	1,803

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	36,350		9.12
Cancelled/forfeited	(400)		7.80
Balance—March 31, 2018	66,630	$	9.79

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):

	Three Months Ended
	March 31,
	2018		2017
Research and development	$	108	$	172
General and administrative		433		226
Sales and marketing		84		33
Total	$	625	$	431

Schedule of Fair Value Assumptions

	Option Plan				ESPP
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Expected volatility	51.9-52.0	%	47.2-47.3	%	66.2-72.7	%	—	%
Risk-free interest rate	2.70-2.72	%	2.0-2.1	%	0.94	%	—	%
Expected term (in years)	6.08		5.8-6.0		0.5		—
Dividend yield	—	%	—	%	—	%	—	%