Quarterly report pursuant to Section 13 or 15(d)

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

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Stock Option Plans - Effects of Stock-Based Compensation Related to Stock Option Awards (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 763,582 $ 172,734 $ 1,293,705 $ 289,869
Cost of Revenues [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 20,496 11,967 40,908 14,179
Research and Development [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 143,069 35,962 157,171 90,798
General and Administrative [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation 552,713 94,112 1,021,568 152,267
Sales and Marketing [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total stock-based compensation $ 47,304 $ 30,693 $ 74,058 $ 32,625