Summary of Activity Relating to Company's Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
|
9 Months Ended |
|
Sep. 30, 2016
$ / shares
shares
|
|---|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
| Beginning Balance, Number of Units Outstanding | shares |
0
|
| Number of Units, Granted | shares |
526,180
|
| Number of Units, Vested | shares |
(9,750)
|
| Number of Units, Forfeited | shares |
(33,245)
|
| Ending Balance, Number of Units Outstanding | shares |
483,185
|
| Number of Units, Expected to vest after September 2016 | shares |
398,525
|
| Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares |
$ 0
|
| Weighted Average Grant Date Fair Value, Granted | $ / shares |
21.65
|
| Weighted Average Grant Date Fair Value, Vested | $ / shares |
19.37
|
| Weighted Average Grant Date Fair Value, Forfeited | $ / shares |
19.24
|
| Weighted Average Grant Date Fair Value, Ending Balance | $ / shares |
21.86
|
| Weighted Average Grant Date Fair Value, Expected To Vest After September 2016 | $ / shares |
$ 21.80
|