Summary of Long-Lived Assets by Geographic Location (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|---|
| Segment Reporting Information [Line Items] | |||
| Property, plant, and equipment, net | $ 4,478 | $ 3,727 | $ 1,295 |
| UNITED STATES | |||
| Segment Reporting Information [Line Items] | |||
| Property, plant, and equipment, net | 4,175 | 3,401 | 921 |
| International | |||
| Segment Reporting Information [Line Items] | |||
| Property, plant, and equipment, net | $ 302 | $ 326 | $ 374 |