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Long-term Debt - Term Loan Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 30, 2017
Oct. 31, 2015
Debt Instrument [Line Items]                  
Term loan agreement amount $ 15,000,000                
Debt drawn down   $ 63,612,000     $ 64,396,000        
Amount drawn down under the term loan agreement 15,000,000                
Minimum liquidity amount         3,000,000   $ 3,000,000    
Minimum net revenue target         15,000,000 $ 5,000,000 $ 1,000,000    
Equity cure period   90 days              
Long-term debt   $ 44,597,000     $ 44,201,000        
Scenario, Forecast                  
Debt Instrument [Line Items]                  
Minimum net revenue target     $ 40,000,000 $ 30,000,000          
Period One                  
Debt Instrument [Line Items]                  
Debt prepayment premium percent   8.00%     8.00%        
Period Two                  
Debt Instrument [Line Items]                  
Debt prepayment premium percent   4.00%     4.00%        
Period Three                  
Debt Instrument [Line Items]                  
Debt prepayment premium percent   2.00%     2.00%        
Term Loan                  
Debt Instrument [Line Items]                  
Term loan agreement amount $ 25,000,000               $ 30,000,000
Stated interest rate 10.75%                
Interest rate paid-in-kind 2.75%                
Interest rate paid in cash 8.00%                
Percentage of outstanding loans 25.00%                
Market capitalization (greater than) $ 250,000,000                
Term Loan, Tranche A                  
Debt Instrument [Line Items]                  
Term loan agreement amount                 $ 20,000,000
Financing fee                 1.75%
Facility fee                 5.00%
Term Loan, Tranche B                  
Debt Instrument [Line Items]                  
Term loan agreement amount                 $ 10,000,000
Debt drawn down               $ 5,000,000