v2.4.0.8
Stock-Based Compensation - Stock-Based Compensation Included in Unaudited Results of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock option/warrant expense, included in total operating expenses $ 19 $ 12 $ 60 $ 104
Officer compensation [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock option/warrant expense, included in total operating expenses 9 7 27 38
Non-employee directors [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock option/warrant expense, included in total operating expenses 4 2 13 11
Sales, general and administrative [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock option/warrant expense, included in total operating expenses 6 3 20 15
Research and development [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock option/warrant expense, included in total operating expenses       $ 40