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Borrowings - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 22, 2019
Jun. 30, 2017
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jun. 20, 2019
Debt Disclosure [Line Items]              
Amounts outstanding under financing arrangements       $ 0   $ 0  
Warrant issued to purchase stock             188,643
Common Stock              
Debt Disclosure [Line Items]              
Warrant exercisable term 7 years            
Revolving Loan | Series C Redeemable Convertible Preferred Stock              
Debt Disclosure [Line Items]              
Warrant issued to purchase stock   62,096          
Warrant exercise price per share   $ 8.052          
TriplePoint Capital LLC              
Debt Disclosure [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000,000            
Line of credit outstanding     $ 20,000,000   $ 20,000,000    
Line of credit facility interest rate         15.23%    
Estimated fair value of warrants $ 600,000            
Interest expense     700,000   $ 700,000    
Line of Credit Facility, Frequency of Payments       36 equal monthly payments of principal, plus accrued interest, from April 1, 2020 through March 1, 2023      
Percentage of prepayment fee 1.00%            
Percentage of principle payment amount 2.75%            
Fees paid to lender $ 300,000            
TriplePoint Capital LLC | Common Stock              
Debt Disclosure [Line Items]              
Warrant issued to purchase stock 65,502            
Warrant exercise price per share $ 9.16            
Warrant exercisable term 7 years            
TriplePoint Capital LLC | Maximum | Option One              
Debt Disclosure [Line Items]              
Line of credit outstanding $ 15,000,000            
TriplePoint Capital LLC | Minimum | Option Two              
Debt Disclosure [Line Items]              
Line of credit outstanding 15,000,000            
TriplePoint Capital LLC | Revolving Loan              
Debt Disclosure [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 10,000,000          
Line of credit outstanding   $ 5,000,000          
Line of credit facility interest rate   5.50%     19.22%    
Line of credit facility maturity date       Dec. 31, 2018      
Line of credit facility extended maturity date       Mar. 22, 2019      
Estimated fair value of warrants   $ 100,000          
Debt Instrument, term   1 year 6 months          
Interest expense     $ 0   $ 200,000    
Repayments of amount outstanding $ 5,100,000            
TriplePoint Capital LLC | Revolving Loan | Series C Redeemable Convertible Preferred Stock              
Debt Disclosure [Line Items]              
Warrant issued to purchase stock   62,096          
Warrant exercise price per share   $ 8.052          
Warrant exercisable term   7 years          
TriplePoint Capital LLC | Prime Rate | Option One              
Debt Disclosure [Line Items]              
Interest rate, prime rate plus 5.00%            
TriplePoint Capital LLC | Prime Rate | Option Two              
Debt Disclosure [Line Items]              
Interest rate, prime rate plus 6.50%            
TriplePoint Capital LLC | Prime Rate | Revolving Loan              
Debt Disclosure [Line Items]              
Interest rate, prime rate plus   6.75%