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Stock Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation expense
Compensation cost for restricted stock awards, restricted stock units, stock options and the ESPP included in cost of revenue; selling, general and administrative expense; and research and development expense is as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2015
 
2014
 
2015
 
2014
Cost of revenue
 
$
147

 
$
190

 
$
353

 
$
442

Selling, general and administrative
 
657

 
733

 
1,023

 
988

Research and development
 
207

 
243

 
474

 
491

Total stock-based compensation expense
 
$
1,011

 
$
1,166

 
$
1,850

 
$
1,921
Restricted stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of employee stock purchase plan weighted-average assumptions
The following table summarizes the amount of compensation expense recognized for restricted stock awards for the three and six months ended June 30, 2015 and 2014 (in thousands): 
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2015
 
2014
 
2015
 
2014
Service-based restricted stock awards
 
$
579

 
$
716

 
$
999

 
$
1,149

Performance-based restricted stock awards
 
(50
)
 
7

 
(44
)
 
13

Total compensation expense recognized for restricted stock awards
 
$
529

 
$
723

 
$
955

 
$
1,162
Restricted stock unit awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation expense
The following table summarizes the amount of compensation expense recognized for employee restricted stock units for the three and six months ended June 30, 2015 (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2015
 
2014
 
2015
 
2014
Service-based restricted stock units
 
$
205

 
$
32

 
$
287

 
$
32

Performance-based restricted stock units
 
(27
)
 
$
—

 
$
32

 
$
—

Market-condition restricted stock units
 
34

 
22

 
67

 
22

Total compensation expense recognized for employee restricted stock units
 
$
212

 
$
54

 
$
386

 
$
54
Employee stock purchase plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation expense
The fair value of the ESPP shares for the three and six months ended June 30, 2015 and 2014 was estimated using the Black-Scholes valuation model for a call and a put option with the following weighted-average assumptions:
 
 
Three and Six Months Ended
 
 
June 30,
 
 
2015
 
2014
Expected dividends
 
$
—

 
$
—

Exercise price
 
$
5.97

 
$
7.77

Expected volatility
 
54
%
 
71
%
Risk-free interest rate
 
0.11
%
 
0.07
%
Expected life/term (in years)
 
0.5

 
0.5

Fair value per share
 
$
5.97

 
$
7.65
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of valuation assumptions for fair value of stock options granted
The fair value of the stock options granted during three months and six months ended June 30, 2015 was estimated using the Black-Scholes valuation model with the following assumptions:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2015
 
2015
Expected dividends
 
$
—

 
$
—

Exercise price
 
$
6.03

 
$
7.16

Expected volatility
 
60
%
 
60
%
Average risk-free interest rate
 
1.55
%
 
1.58
%
Expected life/term (in years)
 
5.0

 
5.0

Fair value per share
 
$
2.74

 
$
3.56