Stockholders' Equity - Initial Public Offering and Follow-on Public Offering (Details) - Common Stock
$ / shares in Units, $ in Millions |
|
1 Months Ended |
12 Months Ended |
May. 02, 2014 |
Nov. 30, 2014
USD ($)
$ / shares
shares
|
May. 31, 2014
USD ($)
$ / shares
shares
|
Dec. 31, 2014
shares
|
| Class of Stock [Line Items] |
|
|
|
|
| Shares sold |
|
|
|
8,941,250
|
| Shares of common stock issued for conversion of series A preferred |
|
|
2,857,143
|
|
| Issuance of common stock in follow-on offering, net of underwriting discounts and offering costs (in shares) |
|
|
|
1,960,390
|
| IPO |
|
|
|
|
| Class of Stock [Line Items] |
|
|
|
|
| Shares sold |
|
|
8,941,250
|
|
| Public offering price (in dollars per share) | $ / shares |
|
|
$ 9.00
|
|
| Net proceeds | $ |
|
|
$ 69.2
|
|
| Over-Allotment Option |
|
|
|
|
| Class of Stock [Line Items] |
|
|
|
|
| Shares sold |
|
|
1,166,250
|
|
| Follow On Public Offering |
|
|
|
|
| Class of Stock [Line Items] |
|
|
|
|
| Public offering price (in dollars per share) | $ / shares |
|
$ 17.00
|
|
|
| Issuance of common stock in follow-on offering, net of underwriting discounts and offering costs (in shares) |
|
1,960,390
|
|
|
| Shares sold |
|
5,402,601
|
|
|
| Net proceeds | $ |
|
$ 30.8
|
|
|
| Conversion of convertible preferred stock |
|
|
|
|
| Class of Stock [Line Items] |
|
|
|
|
| Reverse split of common stock |
0.6667
|
|
|
|