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Debt - Xcel Loan Narrative (Details)
3 Months Ended
Feb. 11, 2019
USD ($)
loan
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Debt      
Interest expense   $ 280,000 $ 294,000
Debt instrument, fee amount   27,000  
Xcel Term Loan      
Debt      
Capacity available to convert to incremental term loans $ 5,000,000    
Interest expense   $ 256,000 $ 288,000
Effective interest rate (as percentage)   6.60% 6.60%
Xcel Term Loan A      
Debt      
Stated interest rate (as percentage) 5.10%    
Xcel Term Loan B      
Debt      
Stated interest rate (as percentage) 6.25%    
Second Amended And Restated Loan And Security Agreement      
Debt      
Minimum net worth required to meet loan covenant $ 90,000,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan      
Debt      
Face amount of loan $ 22,000,000    
Number of term loans | loan 2    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan | Fiscal quarters ending March 31, 2021 through September 30, 2021      
Debt      
Minimum liquid assets to meet loan covenants $ 2,500,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan | Fiscal quarter ending December 31, 2021      
Debt      
Minimum liquid assets to meet loan covenants 3,000,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan | After December 31 2021      
Debt      
Minimum liquid assets to meet loan covenants 5,000,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan | Fiscal year beginning after December 31, 2020      
Debt      
Maximum capital expenditures required to meet loan covenants 700,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan A      
Debt      
Face amount of loan 7,300,000    
Second Amended And Restated Loan And Security Agreement | Xcel Term Loan B      
Debt      
Face amount of loan $ 14,700,000    
Revolving Credit Facility | Xcel Term Loan | Base Rate      
Debt      
Basis spread on variable rate 2.00%    
Debt Termination Period, On Or Before Second Anniversary | Xcel Term Loan A      
Debt      
Termination fee percentage 1.00%    
Debt Termination Period, On Or Before Second Anniversary | Xcel Term Loan B      
Debt      
Termination fee percentage 2.00%    
Debt Termination Period, After Second Anniversary But Before Third Anniversary | Xcel Term Loan A      
Debt      
Termination fee percentage 0.50%    
Debt Termination Period, After Second Anniversary But Before Third Anniversary | Xcel Term Loan B      
Debt      
Termination fee percentage 1.00%    
Debt Termination Period, After Third Anniversary      
Debt      
Termination fee percentage 0.00%