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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 17, 2015
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Accounting Policies [Line Items]    
Common stock, par value | $ / shares $ 0.01 $ 0.01
Concentration of credit risk uninsured cash amount | $   $ 8.9
Cash, Uninsured Amount, Commentary   We deposit our cash with financial institutions which we believe have sufficient credit quality to minimize the risk of loss
Common Stock    
Accounting Policies [Line Items]    
Capital issued for Spin-off transaction (in shares)   8,101,371
Spinoff    
Accounting Policies [Line Items]    
Stockholders equity, spinoff description   On the distribution date, stockholders of PGSC received one share of Company common stock for every twenty shares of PGSC common stock held.
Stockholders equity, spinoff conversion ratio 0.05  
Spinoff | Common Stock    
Accounting Policies [Line Items]    
Capital issued for Spin-off transaction (in shares) 8,101,371  
Paramount Gold and Silver Corp.    
Accounting Policies [Line Items]    
Parent's ownership interest   100.00%