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Subsequent Events (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 10, 2014 | Jun. 30, 2014 | Jun. 13, 2014 | May 21, 2014 | May 06, 2014 | Apr. 29, 2014 | Jul. 10, 2014 Subsequent Events | Jul. 10, 2014 Subsequent Events
Subsequent events |  |  |  |  |  |  |  |
Proceeds from private placement | $ 35,600,000 |  |  |  |  |  | $ 200,000 | $ 35,600,000
Net proceeds from private placement after payment commission and fees | 31,300,000 |  |  |  |  |  | 179,500 | 31,300,000
Commission and fees paid |  |  |  |  |  |  | $ 20,500 |
Number of shares of common stock issued in private placement |  | 8,845,685 |  |  |  |  |  | 8,895,685
Number of warrants issued in private placement |  |  |  |  |  |  |  | 2,668,706
Number of shares of common stock to be purchased |  |  |  |  |  |  | 0.3 | 0.3
Purchase price of each common stock/warrant (in dollars per unit) | $ 4.00 |  | $ 4.00 | $ 4.00 | $ 4.00 | $ 4.00 | $ 4.00 | $ 4.00
Initial exercise price of warrants (in dollars per share) |  |  |  |  |  |  | $ 4.80 | $ 4.80

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