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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 514 $ 724 $ 1,538 $ 2,178
Cost of Revenues        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 83 59 219 163
Research and Development        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 45 93 140 316
General and Administrative        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 356 530 1,095 1,586
Sales and Marketing        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 30 $ 42 $ 84 $ 113