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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Oct. 11, 2016
Class of Warrant or Right [Line Items]        
Common stock, par value (in usd per share) $ 0.01   $ 0.01  
IPO        
Class of Warrant or Right [Line Items]        
Number of securities called by warrants or rights (in shares)       10,000,000
Common stock, par value (in usd per share)       $ 3.00
Increase in fair value of warrants exercised   $ 9.8    
Warrants outstanding (in shares) 0   0  
Sales Agreement        
Class of Warrant or Right [Line Items]        
Value of non-cash consideration received (in shares) 84,896