Stock-Based Compensation - Share-Based Compensation Included in Unaudited Results of Operations (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Total stock option/warrant expense, included in total operating expenses | $ 77 | $ 51 |
| 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 | 33 | 23 |
| 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 | 16 | 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 | $ 28 | $ 17 |