|
Subsequent events (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
1 Months Ended | 2 Months Ended | 1 Months Ended | |
|---|---|---|---|---|
|
Jul. 31, 2013
|
Feb. 29, 2012
|
Dec. 31, 2014
|
Jan. 31, 2015
|
|
| Subsequent events | ||||
| Number of shares of common stock issued in initial public offering | 4,255,000 | 6,325,000 | 1,346,676 | |
| Net proceeds from shares of common stock issued in initial public offering | $ 56.8 | |||
| Subsequent events | ||||
| Subsequent events | ||||
| Number of shares of common stock issued in initial public offering | 276,663 | |||
| Net proceeds from shares of common stock issued in initial public offering | 2.5 | |||
| Subsequent events | Underwriting agreement | ||||
| Subsequent events | ||||
| Shares offering through underwriting agreement | 1,087,500 | |||
| Number of shares of common stock issued in initial public offering | 8,337,500 | |||
| Share price for underwriting agreement | $ 6.50 | |||
| Net proceeds from shares of common stock issued in initial public offering | $ 50.9 | |||