|
Summary of Significant Accounting Policies (Details) (USD $)
|
0 Months Ended |
12 Months Ended |
|
|
|
Oct. 07, 2014
|
Jun. 25, 2014
|
Jun. 11, 2014
|
Apr. 24, 2014
|
Dec. 31, 2014
item
|
Dec. 31, 2013
|
Oct. 07, 2014
|
Jun. 11, 2014
|
| Summary of Basis of Presentation and Significant Accounting Policies |
|
|
|
|
|
|
|
|
| Conversion of convertible preferred stock into common stock (in shares) |
|
|
19,465,132 |
|
|
|
|
|
| Number of shares of common stock issued in satisfaction of accumulated dividends accrued on the preferred stock |
|
|
2,862,654 |
|
|
|
|
|
| Initial public offering |
|
|
|
|
|
|
|
|
| Shares sold |
2,750,000 |
|
6,500,000 |
|
|
|
|
|
| Share issue price (in dollars per share) |
$ 18.25 |
|
$ 8.00 |
|
|
|
$ 18.25 |
$ 8.00 |
| Proceeds from the sale of common stock |
$ 46,900,000 |
|
|
|
$ 103,804,000 |
|
|
|
| Options exercised by underwriters (in shares) |
378,524 |
512,744 |
|
|
|
|
|
|
| Aggregate proceeds received, net of underwriting discounts and commissions and offering costs |
53,400,000 |
50,400,000 |
|
|
|
|
|
|
| Common Stock, Shares Authorized |
|
|
200,000,000 |
|
200,000,000 |
100,000,000 |
|
200,000,000 |
| Reverse stock-split ratio |
|
|
|
2.28 |
|
|
|
|
| Number of operating segment |
|
|
|
|
1 |
|
|
|
| Number of geographic segment |
|
|
|
|
1 |
|
|
|
| Marketable Securities |
|
|
|
|
|
|
|
|
| Other-than-temporary impairment losses |
|
|
|
|
0 |
|
|
|
| Realized gains or losses on the sale of securities |
|
|
|
|
0 |
0 |
|
|
| Impairment of Long-Lived Assets |
|
|
|
|
|
|
|
|
| Impairment charges |
|
|
|
|
$ 0 |
|
|
|
| Stock-Based Compensation |
|
|
|
|
|
|
|
|
| Expected dividend yield (as a percent) |
|
|
|
|
0.00% |
|
|
|
| Common Stock |
|
|
|
|
|
|
|
|
| Summary of Basis of Presentation and Significant Accounting Policies |
|
|
|
|
|
|
|
|
| Conversion of convertible preferred stock into common stock (in shares) |
|
|
|
|
22,327,786 |
|
|
|
| Initial public offering |
|
|
|
|
|
|
|
|
| Shares sold |
|
|
|
|
10,141,268 |
|
|
|
| Warrants issued for purchase of shares of common stock (in shares) |
|
|
149,452 |
|
|
|
|
149,452 |