Description of the Business (Details) - USD ($) $ / shares in Units, $ in Millions |
Sep. 30, 2015 |
Apr. 02, 2014 |
|---|---|---|
| Public Offering | ||
| Common stock sold and issued (in shares) | 8,626,377 | |
| Issuance price (in dollars per share) | $ 34.00 | $ 13.00 |
| Net proceed from IPO. after deducting underwriting discounts and commissions and other offering expenses | $ 100.3 | |
| Net proceeds from sale of common stock net accrued costs | $ 117.1 | |
| Underwriting discounts and commissions | 5.5 | 7.8 |
| Offering expenses | $ 0.6 | $ 4.0 |
| Redeemable convertible preferred stock converted into shares of common stock | 23,501,208 | |
| Preferred stock warrant liability | $ 0.8 | |
| Public | ||
| Public Offering | ||
| Common stock sold and issued (in shares) | 3,625,000 | |
| Underwriters' over-allotment option | ||
| Public Offering | ||
| Common stock sold and issued (in shares) | 525,000 |