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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2018
Mar. 30, 2019
Mar. 31, 2018
May 06, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Debt issuance costs   $ 553,000     $ 612,000
Amortization of debt issuance costs   58,000 $ 9,000    
Loan facility | 2018 Term Loan Facility          
Debt Instrument [Line Items]          
Debt, outstanding balance   20,000,000     20,000,000
Loan facility | Equipment financing loan          
Debt Instrument [Line Items]          
Debt, outstanding balance   5,000,000     $ 5,000,000
Interest expense   $ 100,000 0    
Interest rate   11.75%     11.50%
Line of credit | SVB Credit Facilities          
Debt Instrument [Line Items]          
Interest expense   $ 600,000 $ 18,000    
Line of credit | 2018 Term Loan Facility          
Debt Instrument [Line Items]          
Current borrowing capacity   $ 0      
Interest rate   9.50%      
Line of credit | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt, outstanding balance   $ 6,000,000     $ 6,000,000
Variable annual interest rate, additional upon default 5.00%        
Current borrowing capacity   $ 0      
Interest rate   6.25%      
Advance at closing | Loan facility | 2018 Term Loan Facility          
Debt Instrument [Line Items]          
Debt, face amount $ 10,000,000.0        
Variable annual interest rate 4.00%        
Advance at closing | Loan facility | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt, face amount $ 6,000,000.0        
Advance if no event of default through borrowing date | Loan facility | 2018 Term Loan Facility          
Debt Instrument [Line Items]          
Debt, face amount 5,000,000.0        
Advance if no event of default, based on minimum level of gross profit | Loan facility | 2018 Term Loan Facility          
Debt Instrument [Line Items]          
Debt, face amount $ 5,000,000.0        
Minimum | Line of credit | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Variable annual interest rate 0.75%        
Maximum | Line of credit | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Variable annual interest rate 1.25%        
Common Stock | Line of credit | SVB Credit Facilities          
Debt Instrument [Line Items]          
Number of warrants issued (in shares) 60,002 60,002      
Exercise price (in dollars per share) $ 3.00 $ 3.00      
Series B          
Debt Instrument [Line Items]          
Number of warrants issued (in shares) 121,694 121,694      
Exercise price (in dollars per share) $ 1.07 $ 1.07      
Series E          
Debt Instrument [Line Items]          
Number of warrants issued (in shares) 39,073 39,073      
Exercise price (in dollars per share) $ 3.68 $ 3.68      
IPO | Subsequent event | Common Stock          
Debt Instrument [Line Items]          
Number of warrants issued (in shares)       160,767