Summary of Significant Accounting Policies - Schedule of Stock-Based Compensation Expense Allocation (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total | $ 1,750 | $ 607 | $ 475 |
| Cost of Revenues [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total | 79 | 44 | 14 |
| Sales and Marketing [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total | 38 | 28 | |
| Research and Development [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total | 1,126 | 2 | |
| General and Administrative [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total | $ 507 | $ 533 | $ 461 |