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Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense related to stock options $ 110 $ 42
Cost of Revenue [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense related to stock options 13 11
Research and Development [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense related to stock options 62 7
Selling, General and Administrative [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense related to stock options $ 35 $ 24