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Subsequent Events - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
May 05, 2017
Apr. 18, 2017
Mar. 31, 2017
Dec. 31, 2014
Senior convertible notes due December 31, 2019        
Subsequent Event [Line Items]        
Conversion of notes to common shares, value     $ 5,000,000  
Less portion of commitment asset        
Subsequent Event [Line Items]        
Cash repayment of senior notes under exchange agreement     4,000,000  
Conversion of notes to common shares, value     $ 1,000,000  
Deerfield        
Subsequent Event [Line Items]        
Conversion of notes to common shares, shares       3,464,616
Deerfield | Less portion of commitment asset | Senior convertible notes due December 31, 2019 | Subsequent Event        
Subsequent Event [Line Items]        
Cash repayment of senior notes under exchange agreement   $ 4,000,000    
Conversion of notes to common shares, value   $ 1,000,000    
Deerfield | Tranche B Exchange Shares | Senior convertible notes due December 31, 2019 | Subsequent Event        
Subsequent Event [Line Items]        
Conversion of notes to common shares, shares   869,565    
Exchange price per share   $ 1.15    
Deerfield | Tranche 1 Notes | Senior convertible notes due December 31, 2019 | Subsequent Event        
Subsequent Event [Line Items]        
Conversion of notes to common shares, value   $ 5,000,000    
Conversion of notes to common shares, shares   4,347,826    
Russell Ranch Road II LLC [Member] | Subsequent Event        
Subsequent Event [Line Items]        
Lease monthly rental payments $ 40,951      
Percentage of annual increase in lease payment 3.00%      
Lease expiration period 65 months      
Lease renewal option 5 years