Stock Plans (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock Options Activity

The following table summarizes total aggregate stock option activity for the year ended December 31, 2018 (in thousands, except for per share data):

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Balance at December 31, 2017	361		$	8.05
Granted	30		5.37
Cancelled	(35	)	9.41
Balance at December 31, 2018	356		7.69		5.65	$	—
Vested or expected to vest at December 31, 2018	354		7.70		5.64	—
Exercisable at December 31, 2018	270		8.20		5.10	—

Stock Options, Valuation Assumptions

The fair value of the stock options granted during the years ended December 31, 2018 and 2017 was estimated using the Black-Scholes valuation model using the following assumptions:

	Years Ended December 31,
	2018		2017
Expected dividends	—	%	—	%
Expected volatility weighted average	54	%	59	%
Risk-free interest rate	3.0	%	1.9	%
Expected life/term weighted average (in years)	5.5		5.5

Nonvested Restricted Stock Units Activity

The following table summarizes RSU activity for both service-based awards and performance-based awards for the year ended December 31, 2018 (in thousands, except for per share data):

	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017	2,650		$	6.16
Granted	1,544		6.12
Released	(570	)	5.92
Vested with deferred settlement	(45	)	5.64
Forfeited	(821	)	6.22
Nonvested at December 31, 2018	2,758		6.18

Stock-based Compensation Expense Allocation

Compensation cost for stock options, RSAs, RSUs, ESPP, bonuses and director fees for the years ended December 31, 2018 and 2017, respectively, is as follows (in thousands):

	Years Ended December 31,
	2018			2017
Stock options	$	271		$	237
Restricted stock awards	83			416
Restricted stock units	6,286			5,186
ESPP	148			114
Bonuses settled in stock	1,986			2,826
Director fees settled in stock	304			258
Total stock-based compensation expense, including discontinued operations	9,078			9,037
Less: stock-based compensation expense related to discontinued operations	(31		)	(798		)
Total stock-based compensation expense, continuing operations	$	9,047		$	8,239

Stock-based compensation cost included in cost of revenue; selling, general and administrative expense; and research and development expense for the years ended December 31, 2018 and 2017, respectively, is as follows (in thousands):

	Years Ended December 31,
	2018		2017
Cost of revenue	$	1,077	$	948
Selling, general and administrative	6,635		6,065
Research and development	1,335		1,226
Total stock-based compensation expense	$	9,047	$	8,239

Employee Stock Purchase Plan, Valuation Assumptions

The fair value of ESPP awards was calculated using the following weighted-average assumptions:

	Years Ended December 31,
	2018			2017
Expected dividends	—		%	—		%
Expected volatility	42		%	34		%
Risk-free interest rate	1.88		%	0.89		%
Expected life (in years)	0.50			0.45
Fair value per share	$	1.28		$	1.30

Schedule of Stock Plan Shares Reserved for Future Issuance

The following table summarizes the shares available for grant under the Company’s stock-based compensation plans as of December 31, 2018:

2013 Omnibus Equity Incentive Plan	3,067,729
2004 Employee Stock Purchase Plan	458,065
Total	3,525,794

Unvested restricted stock awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Nonvested Restricted Stock Shares Activity

The following table summarizes RSA activity for the year ended December 31, 2018 (in thousands, except for per share data):

	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017	26		$	14.57
Vested	(25	)	14.57
Forfeited	(1	)	14.57
Nonvested at December 31, 2018	—		—

Unvested restricted stock unit awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Market-condition PSUs, Valuation Assumptions [Table Text Block]

The fair value of market-condition RSUs granted was calculated using a Monte Carlo valuation model with the following assumptions:

	Years Ended December 31,
	2018		2017
Expected dividend yield	—	%	—	%
Expected volatility	41% - 47%		53	%
Risk-free interest rate	2.36% - 2.60%		1.55	%
Expected term (in years)	2.5 - 2.9		2.8

Stock-based Compensation Expense Allocation

The following table summarizes the amount of compensation expense recognized for RSUs for the years ended December 31, 2018 and 2017 (in thousands):

	Years Ended December 31,
RSU Type	2018		2017
Service-based	$	4,054	$	3,268
Performance objectives	320		379
Market-condition	1,912		1,539
	$	6,286	$	5,186