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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
May 06, 2019
May 05, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Debt issuance costs   $ 533,000   $ 533,000       $ 612,000
Amortization of debt issuance costs   $ 20,000 $ 26,000 $ 78,000 $ 35,000      
Warrants outstanding (in shares)   0   0        
Loan facility | 2018 Term Loan Facility                
Debt Instrument [Line Items]                
Debt, outstanding balance   $ 20,000,000   $ 20,000,000       20,000,000
Loan facility | Equipment financing loan                
Debt Instrument [Line Items]                
Debt, outstanding balance   5,000,000   5,000,000       $ 5,000,000
Interest expense   $ 200,000 0 $ 300,000 0      
Interest rate   11.75%   11.75%       11.50%
Line of credit | SVB Credit Facilities                
Debt Instrument [Line Items]                
Interest expense   $ 500,000 22,000 $ 1,100,000 40,000      
Line of credit | 2018 Term Loan Facility                
Debt Instrument [Line Items]                
Current borrowing capacity   $ 0   $ 0        
Interest rate   9.50%   9.50%        
Line of credit | 2018 Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt, outstanding balance   $ 6,000,000   $ 6,000,000       $ 6,000,000
Variable annual interest rate, additional upon default 5.00%              
Current borrowing capacity   $ 0   $ 0        
Interest rate   6.25%   6.25%        
Advance at closing | Loan facility | 2018 Term Loan Facility                
Debt Instrument [Line Items]                
Debt, face amount $ 10,000,000.0   10,000,000.0   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   6,000,000.0   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   5,000,000.0   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   $ 5,000,000.0   $ 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   60,002   60,002  
Exercise price (in dollars per share) $ 3.00   $ 3.00   $ 3.00   $ 3.00  
Series B                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) 121,694   121,694   121,694   121,694  
Exercise price (in dollars per share) $ 1.07   $ 1.07   $ 1.07   $ 1.07  
Series E                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) 39,073   39,073   39,073   39,073  
Exercise price (in dollars per share) $ 3.68   $ 3.68   $ 3.68   $ 3.68  
IPO | Common Stock                
Debt Instrument [Line Items]                
Number of warrants issued (in shares)           160,767