Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Effects of Stock-Based Compensation Related to Stock Option Awards (Detail)

v3.5.0.2
Stock-Based Compensation - Effects of Stock-Based Compensation Related to Stock Option Awards (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 490 $ 757 $ 1,024 $ 1,454
Cost of Revenues        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 67 55 136 104
Research and Development        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 45 128 95 223
General and Administrative        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 352 535 739 1,056
Sales and Marketing        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 26 $ 39 $ 54 $ 71