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Stock Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2013
 
2014
 
2013
Cost of revenue
 
$
145

 
$
228

 
$
587

 
$
762

Selling, general and administrative
 
716

 
332

 
1,705

 
1,337

Research and development
 
150

 
159

 
642

 
523

Total stock-based compensation expense
 
$
1,011

 
$
719

 
$
2,934

 
$
2,622
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 nine months ended September 30, 2014 and 2013 (in thousands): 
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2013
 
2014
 
2013
Service-based restricted stock awards
 
$
696

 
$
523

 
$
1,834

 
$
1,793

Performance-based restricted stock awards
 
7

 
40

 
20

 
82

Total compensation expense recognized for restricted stock awards
 
$
703

 
$
563

 
$
1,854

 
$
1,875
Restricted Stock Unit
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of employee stock purchase plan weighted-average assumptions
Since the vesting of the market-condition restricted stock units is dependent on stock price performance, the fair values of these awards were estimated using a Monte-Carlo valuation model with the following weighted-average assumptions:
Market price at grant per share
 
$
15.03

Expected dividends
 
$
—

Expected volatility
 
65
%
Risk-free interest rate
 
0.86
%
Fair value per unit
 
$
7.71
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 nine months ended September 30, 2014 and 2013 (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2013
 
2014
 
2013
Service-based restricted stock units
 
$
51

 
$
—

 
$
83

 
$
—

Market-condition restricted stock units
 
34

 
—

 
56

 
—

Total compensation expense recognized for employee restricted stock units
 
$
85

 
$
—

 
$
139

 
$
—
Employee Stock [Member]
  
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 nine months ended September 30, 2014 was estimated using the Black-Scholes valuation model for a call and a put option with the following weighted-average assumptions:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2014
 
2014
Expected dividends
 
$
—

 
$
—

Exercise price
 
$
8.72

 
$
8.09

Expected volatility
 
61
%
 
68
%
Risk-free interest rate
 
0.02
%
 
0.05
%
Expected life/term (in years)
 
0.3

 
0.5

Fair value per share
 
$
2.37

 
$
5.89