Description of Business (Details) $ / shares in Units, $ in Millions |
1 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Jul. 31, 2015
USD ($)
$ / shares
shares
|
Dec. 31, 2016
segment
|
Dec. 31, 2015
$ / shares
shares
|
|
| Number of operating segments | segment | 1 | ||
| Common stock | |||
| Initial public offering (in shares) | shares | 10,900,000 | ||
| Initial public offering price (in dollars per share) | $ / shares | $ 11.57 | ||
| IPO | Common stock | |||
| Initial public offering (in shares) | shares | 10,900,000 | ||
| Initial public offering price (in dollars per share) | $ / shares | $ 18.00 | ||
| Proceeds from initial public offering, net of offering costs | $ | $ 178.5 | ||