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Common Stock, Warrant, Preferred Stock and Dividends (Tables)
 12 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Schedule of preferred shares and common shares
​ ​ ​
2015
 ​ ​
2014
 ​ ​ ​ ​ ​ ​ ​ ​
2015
 ​ ​
2014
 ​
As of June 30
 ​ ​
Authorized Shares
 ​ ​
Par value
 ​ ​
Issued and outstanding shares
 ​
Preferred stock
 ​ ​ ​ ​ 16,000,000 ​ ​ ​ ​ ​ 16,000,000 ​ ​ ​ ​ $ 0.0001 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Common stock−Class A
 ​ ​ ​ ​ 300,000,000 ​ ​ ​ ​ ​ 300,000,000 ​ ​ ​ ​ $ 0.0001 ​ ​ ​ ​ ​ 17,747,793 ​ ​ ​ ​ ​ 17,442,953 ​ ​
Common stock−Class B
 ​ ​ ​ ​ 30,000,000 ​ ​ ​ ​ ​ 30,000,000 ​ ​ ​ ​ $ 0.0001 ​ ​ ​ ​ ​ 21,320,275 ​ ​ ​ ​ ​ 21,348,600 ​ ​