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Debt and Contingent Obligations - Xcel Term Loan Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 11, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 01, 2020
Apr. 30, 2020
Feb. 10, 2019
Xcel Term Loan                      
Debt Instrument [Line Items]                      
Aggregate interest expense on Prior Term Debt and Xcel Term Loan   $ 317,000 $ 215,000 $ 903,000 $ 677,000            
Secured Debt                      
Debt Instrument [Line Items]                      
Percentage of excess cash flow 10.00%                    
Secured Debt | Second Amended And Restated Loan And Security Agreement                      
Debt Instrument [Line Items]                      
Face amount of loan $ 22,000,000.0                   $ 14,500,000
Upfront fee for debt issuance 90,000                    
Minimum net worth required to meet loan covenant 90,000,000.0                    
Maximum capital expenditures required to meet loan covenants               $ 1,700,000.0      
Secured Debt | Term Loan A                      
Debt Instrument [Line Items]                      
Face amount of loan $ 7,300,000                    
Stated interest rate (as percentage) 5.10%                    
Secured Debt | Additional Term Loan                      
Debt Instrument [Line Items]                      
Face amount of loan $ 7,500,000.0                    
Loss on extinguishment of debt       $ 200,000              
Secured Debt | Term Loan B                      
Debt Instrument [Line Items]                      
Face amount of loan $ 14,700,000                    
Stated interest rate (as percentage) 6.25%                    
Revolving Credit Facility | Second Amended And Restated Loan And Security Agreement                      
Debt Instrument [Line Items]                      
Capacity available to convert to incremental term loans $ 5,000,000.0                    
Revolving Credit Facility | Second Amended And Restated Loan And Security Agreement | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 2.00%                    
Debt Termination Period, On Or Before Second Anniversary | Secured Debt | Term Loan A                      
Debt Instrument [Line Items]                      
Termination fee percentage 1.00%                    
Debt Termination Period, On Or Before Second Anniversary | Secured Debt | Term Loan B                      
Debt Instrument [Line Items]                      
Termination fee percentage 2.00%                    
Debt Termination Period, After Second Anniversary But Before Third Anniversary | Secured Debt | Term Loan A                      
Debt Instrument [Line Items]                      
Termination fee percentage 0.50%                    
Debt Termination Period, After Second Anniversary But Before Third Anniversary | Secured Debt | Term Loan B                      
Debt Instrument [Line Items]                      
Termination fee percentage 1.00%                    
Debt Termination Period, After Third Anniversary | Secured Debt                      
Debt Instrument [Line Items]                      
Termination fee percentage 0.00%                    
Forecast | Secured Debt | Second Amended And Restated Loan And Security Agreement                      
Debt Instrument [Line Items]                      
Minimum liquid assets to meet loan covenants                 $ 5,000,000.0 $ 4,000,000.0  
Maximum capital expenditures required to meet loan covenants           $ 700,000.0 $ 900,000.0