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Debt - Narrative (Details)
12 Months Ended
Apr. 21, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Feb. 25, 2021
USD ($)
Jan. 14, 2021
USD ($)
May 06, 2019
shares
May 05, 2019
$ / shares
shares
Debt Instrument [Line Items]                
Maximum annual dividend payment $ 10,000,000.0              
Debt issuance costs   $ 0 $ 431,000          
Amortization of debt issuance costs   $ 256,000 $ 181,000 $ 109,000        
Warrants outstanding (in shares) | shares   0 0          
Repayments on revolving credit facility   $ 25,000,000 $ 0 0        
Series B                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) | shares   121,694           121,694
Exercise price (in dollars per share) | $ / shares   $ 1.07           $ 1.07
Series E                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) | shares   39,073           39,073
Exercise price (in dollars per share) | $ / shares   $ 3.68           $ 3.68
Common Stock | IPO                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) | shares             160,767  
Prepaid and Other Current Assets                
Debt Instrument [Line Items]                
Debt issuance costs   $ 1,100,000            
Letter of credit | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 12,500,000    
Line of Credit                
Debt Instrument [Line Items]                
Early termination fee amount 1,200,000              
Interest expense   2,100,000 2,200,000 900,000        
Line of Credit | Revolving credit facility                
Debt Instrument [Line Items]                
Debt, face amount $ 150,000,000.0              
Debt term 5 years              
Maximum additional borrowing capacity $ 200,000,000.0              
Unused commitment fee 0.375%              
Maximum leverage ratio 3.00              
Minimum fixed charge coverage ratio 1.25              
Debt, outstanding balance   25,000,000 0          
Available borrowing capacity   $ 0            
Interest rate   3.50%            
Line of Credit | Revolving credit facility | Subsequent Event                
Debt Instrument [Line Items]                
Debt, outstanding balance         $ 0      
Line of Credit | Revolving credit facility | Alternate Base Rate | Minimum                
Debt Instrument [Line Items]                
Variable annual interest rate 1.25%              
Line of Credit | Revolving credit facility | Alternate Base Rate | Maximum                
Debt Instrument [Line Items]                
Variable annual interest rate 1.75%              
Line of Credit | Revolving credit facility | LIBOR | Minimum                
Debt Instrument [Line Items]                
Variable annual interest rate 2.25%              
Line of Credit | Revolving credit facility | LIBOR | Maximum                
Debt Instrument [Line Items]                
Variable annual interest rate 2.75%              
Line of Credit | Revolving credit facility | SVB Credit Facilities                
Debt Instrument [Line Items]                
Debt, outstanding balance   $ 0 6,000,000          
Line of Credit | Equipment financing loan                
Debt Instrument [Line Items]                
Interest expense   200,000 600,000 $ 200,000        
Debt, outstanding balance   0 5,000,000          
Line of Credit | Term loan facility                
Debt Instrument [Line Items]                
Debt, outstanding balance   $ 0 $ 20,000,000          
Line of Credit | SVB Credit Facilities | Common Stock                
Debt Instrument [Line Items]                
Number of warrants issued (in shares) | shares   60,002           60,002
Exercise price (in dollars per share) | $ / shares   $ 3.00           $ 3.00