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Preferred Stock and Common Stock Warrants - Allocation of net cash proceeds (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Allocation of net cash proceeds      
Proceeds from equity issuance $ 79,055 $ 79,055 $ 30,100
Equity issuance costs (2,104)    
Net proceeds - Initial Fair Value Allocation 76,951    
BCF | Additional Paid-in Capital      
Allocation of net cash proceeds      
Allocation to BCF 2,530    
Per balance sheet upon issuance 2,530    
Series A Convertible Preferred stock      
Allocation of net cash proceeds      
Net proceeds - Initial Fair Value Allocation 41,079    
Allocation to BCF (2,530)    
Per balance sheet upon issuance $ 38,549    
Contractual conversion price $ 7.50 $ 7.50  
Series A Convertible Preferred stock | HGC      
Allocation of net cash proceeds      
Accounting conversion price 6.24 6.24  
Series A Convertible Preferred stock | Fund Purchaser      
Allocation of net cash proceeds      
Accounting conversion price $ 5.58 $ 5.58  
Series A Convertible Preferred stock | BCF      
Allocation of net cash proceeds      
Accretion of stock discount as a deemed dividend $ 2,500    
Series B Convertible Preferred stock      
Allocation of net cash proceeds      
Net proceeds - Initial Fair Value Allocation 26,159    
Per balance sheet upon issuance 26,159    
Common Stock | Additional Paid-in Capital      
Allocation of net cash proceeds      
Net proceeds - Initial Fair Value Allocation 2,108    
Per balance sheet upon issuance 2,108    
Series A Warrants      
Allocation of net cash proceeds      
Net proceeds - Initial Fair Value Allocation 4,859    
Per balance sheet upon issuance 4,859    
Series B Warrants      
Allocation of net cash proceeds      
Net proceeds - Initial Fair Value Allocation 2,746    
Per balance sheet upon issuance $ 2,746