Quarterly report pursuant to Section 13 or 15(d)

Joint Venture Agreement - Additional Information (Details)

v3.10.0.1
Joint Venture Agreement - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 65 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
May 31, 2013
Schedule of Equity Method Investments [Line Items]            
Joint venture net loss     $ 4,000 $ 21,000    
Research and development            
Schedule of Equity Method Investments [Line Items]            
Joint venture net loss $ 1,000 $ 2,000 4,000 $ 21,000    
Equity Method Investee            
Schedule of Equity Method Investments [Line Items]            
Due from related parties, current $ 10,000   $ 10,000   $ 10,000  
Joint Venture Agreement            
Schedule of Equity Method Investments [Line Items]            
Percentage of outstanding membership interests in joint venture (percent)           50.00%
Investment in joint venture         $ 2,000,000  
Fair value of capital contribution in joint venture           $ 6,000,000
Joint Venture Agreement | Maximum            
Schedule of Equity Method Investments [Line Items]            
Required payments to acquire interest in joint venture           $ 6,000,000