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Debt Facility - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 30, 2019
Nov. 02, 2018
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]        
Proceeds from issuance of warrants     $ 15,931  
Solar Capital Limited [Member] | Loan Agreement [Member]        
Debt Instrument [Line Items]        
Repayment of principal amount $ 30,700      
Loss from debt extinguishment $ 1,600      
Interest expense related to loan facility       $ 1,000
Solar Capital Limited [Member] | Loan Agreement [Member] | Initial Loan Facility [Member]        
Debt Instrument [Line Items]        
Warrants issued to purchase of common stock   20,718    
Percentage of warrants issued on term loan funded   3.00%    
Warrants exercise price   $ 43.44    
Warrants termination term   10 years    
Proceeds from issuance of warrants   $ 800