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Related Party Transactions - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2016
Mar. 31, 2019
Mar. 31, 2018
Related Party Transaction [Line Items]      
Change in fair value of derivative financial instruments   $ 8,289,000 $ 2,525,000
Non-employee Stock Options      
Related Party Transaction [Line Items]      
Change in fair value of derivative financial instruments     200,000
Directors      
Related Party Transaction [Line Items]      
Consulting fees paid   10,000 $ 3,000
Montel Media, Inc. | Minimum      
Related Party Transaction [Line Items]      
Beneficially owns common stock percentage     5.00%
Montel Media, Inc. | Consulting Agreement      
Related Party Transaction [Line Items]      
Consulting fees paid     $ 45,000
Consulting monthly fee $ 15,000    
Clinvue LLC      
Related Party Transaction [Line Items]      
Consulting fees paid   $ 0 $ 100,000