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Stock Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation expense
Compensation cost for restricted stock, restricted stock units, employee 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,
 
 
2013
 
2012
 
2013
 
2012
Cost of revenue
 
$
228

 
$
163

 
$
762

 
$
543

Selling, general and administrative
 
332

 
213

 
1,337

 
1,586

Research and development
 
159

 
129

 
523

 
432

Total stock-based compensation expense
 
$
719

 
$
505

 
$
2,622

 
$
2,561
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, 2013 and 2012 (in thousands): 
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
Service-based restricted stock
 
$
523

 
$
369

 
$
1,793

 
$
1,216

Performance-based restricted stock
 
40

 
(198
)
 
82

 
(37
)
Total compensation expense recognized for restricted stock awards
 
$
563

 
$
171

 
$
1,875

 
$
1,179
Schedule of stock-based compensation expense
The Company may determine to grant stock options in the future under its equity incentive plan. The fair value of the stock option granted was estimated using the Black-Scholes valuation model with the following assumptions:
 
 
Nine Months Ended
 
 
September 30,
 
 
2013
Expected dividends
 
$
—

Exercise price
 
$
6.80

Expected volatility
 
68.6
%
Average risk-free interest rate
 
1.1
%
Expected life/term (in years)
 
4.8

Fair value per share
 
$
3.72
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 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,
 
 
2012
 
2012
Expected dividends
 
$
—

 
$
—

Exercise price
 
$
5.58

 
$
8.93

Expected volatility
 
83
%
 
75
%
Average risk-free interest rate
 
0.16
%
 
0.12
%
Expected life/term (in years)
 
0.5

 
0.5

Fair value per share
 
$
2.78

 
$
3.79