Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Property, Plant and Equipment [Abstract] | ||
| Fully depreciated computer software and hardware equipment and furniture, fixtures and equipment write-off | $ 1.4 | $ 2.9 |
| X | ||||||||||
- Definition Fully depreciated computer software hardware and furniture fixtures and equipment writeoff. No definition available.
|
| X | ||||||||||
- References No definition available.
|