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Loans and Security Agreement Narrative (Details)
3 Months Ended
Mar. 16, 2020
USD ($)
day
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jun. 03, 2019
USD ($)
Debt Instrument [Line Items]        
Aggregate principal amount       $ 1,900,000
Net draw down proceeds $ 21,200,000      
Effective interest rate       4.65%
Interest expense     $ 0  
Term Loan | Term Loan        
Debt Instrument [Line Items]        
Aggregate principal amount $ 35,000,000      
Interest rate, base percentage 4.75%      
Interest rate, additional percentage added to base percentage 4.00%      
Initial interest rate percentage 8.75%      
Effective interest rate 10.90%      
Option to add interest rate amount to outstanding principal balance in lieu of paying such amount in cash, percentage 1.00%      
Interest expense   $ 80,907    
Calculation for number of shares of common stock able to be purchased by warrant, percentage of principal amount of relevant Term Loan funded funded 3.50%      
Warrant exercise price calculation, period immediately preceding execution of Loan Agreement, number of trading days | day 5      
Outstanding balance, net of unamortized issuance costs and unaccreted discount   20,700,000    
Unamortized issuance costs and unaccreted discount   $ 1,800,000    
Term Loan | Term Loan | Minimum        
Debt Instrument [Line Items]        
Period for which Company is entitled to make interest-only payments 30 months      
Term Loan | Term Loan | Maximum        
Debt Instrument [Line Items]        
Period for which Company is entitled to make interest-only payments 36 months      
Term Loan | Term Loan, First Tranche        
Debt Instrument [Line Items]        
Aggregate principal amount $ 22,500,000      
Net draw down proceeds 21,200,000      
Closing costs $ 1,300,000      
Exercise price of warrant (in dollars per share)) | $ / shares $ 1.65      
Number of shares of common stock for which warrant is exercisable (in shares) | shares 477,273      
Term Loan | Term Loan, Second and Third Tranches        
Debt Instrument [Line Items]        
Warrant exercise price calculation, period immediately preceding relevant funding, number of trading days | day 5      
Term Loan | Term Loan, Second and Third Tranches | Maximum        
Debt Instrument [Line Items]        
Exercise price of warrant (in dollars per share)) | $ / shares $ 1.65      
Term Loan | Term Loan, Second Tranche        
Debt Instrument [Line Items]        
Aggregate principal amount $ 5,000,000      
Term Loan | Term Loan, Third Tranche        
Debt Instrument [Line Items]        
Aggregate principal amount $ 7,500,000