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Commitments & Contingencies - Underwriting Agreement (Details) - USD ($)
9 Months Ended
Feb. 21, 2018
Sep. 30, 2019
Dec. 31, 2018
Underwriting Agreement      
Underwriting discount paid (per Unit) $ 0.20    
Underwriters discount paid $ 4,500,000    
Deferred underwriting commissions (per Unit)   $ 0.35  
Deferred underwriting commissions   $ 7,875,000 $ 7,875,000
Shares issued (in shares)   7,194,648 7,195,012
Over-Allotment Option      
Underwriting Agreement      
Underwriting option term 45 days    
Number of additional units to be purchased to cover over-allotment 3,750,000    
IPO      
Underwriting Agreement      
Deferred underwriting commissions   $ 7,875,000  
Deerfield Management      
Underwriting Agreement      
Shares issued (in shares) 2,500,000