Restructuring - Additional Information (Detail) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2016 |
|
| Restructuring and Related Activities [Abstract] | ||
| Percentage of workforce reduction | 31.00% | |
| Restructuring charges | $ 1.4 | |
| Stock option modification non cash expense | $ 0.2 |