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Stock-Based Compensation (Details Textual) - Equity Award [Domain] - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 20, 2007
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2001
May. 15, 2015
Oct. 22, 2013
Nov. 02, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 5,300,000   $ 5,300,000          
General and Administrative Expenses and Research and Development Expense [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Allocated Share-based Compensation Expense   $ 587,000 $ 855,000 $ 1,413,000 $ 1,217,000        
Employee [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       1,800,000 1,732,500        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value       $ 3,200,000 $ 4,100,000        
2001 Stock Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   671,607   671,607          
2001 Stock Plan [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           250,000      
2007 Stock Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,500,000 428,657   428,657          
2007 Stock Plan [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 250,000                
2010 Stock Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   6,367,498   6,367,498         3,000,000
2010 Stock Plan [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common Stock, Capital Shares Reserved for Future Issuance             8,000,000 6,000,000  
2010 Stock Plan [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common Stock, Capital Shares Reserved for Future Issuance             6,000,000 3,000,000