Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Stock-Based Compensation - Effects of Stock-Based Compensation Related to Stock Option Awards (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total stock-based compensation $ 534 $ 696
Cost of Revenues    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total stock-based compensation 69 49
Research and Development    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total stock-based compensation 50 95
General and Administrative    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total stock-based compensation 387 521
Sales and Marketing    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total stock-based compensation $ 28 $ 31