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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2013
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Subsidiary, Sale of Stock [Line Items]        
Deferred offering costs   $ 335,000   $ 345,000
Upfront payment received $ 1,500,000      
Deferred revenue recognition period 70 months      
Revenue recognized from upfront payments   100,000 $ 64,000  
Revenue related to assets sold under purchase agreement   0    
Other receivable due from R-Pharm   $ 252,000   $ 233,000
Sales Agreement        
Subsidiary, Sale of Stock [Line Items]        
Deferred offering costs     $ 100,000