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Equity - Additional Information (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Common stock, issued (in shares) 35,687,000 35,650,000
Common stock, outstanding (in shares) 35,687,000 35,650,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Nonvested (in shares) 400,000  
Shares authorized (in shares) 250,000,000.0 250,000,000
Class of Warrant, Number of Securities issued for Each Warrant 1  
Series A Warrants    
Class of Stock [Line Items]    
Issuance of common stock (in shares) 4,600,000  
Exercise price of warrants (in usd per share) $ 41.34  
Series B Warrants    
Class of Stock [Line Items]    
Issuance of common stock (in shares) 2,000,000.0  
Exercise price of warrants (in usd per share) $ 42.03