Quarterly report pursuant to Section 13 or 15(d)

Revenues - Activity (Details)

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Revenues - Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance $ 6,065,000 $ 3,332,000  
Provision related to current period sales 3,299,000 2,232,000  
Credit or payments made during the period (3,958,000) (2,009,000)  
Balance 5,406,000 3,555,000  
Discounts and allowances 3,700,000 2,700,000  
Other accrued liabilities 11,075,000   $ 11,014,000
Other accrued liabilities      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance   3,500,000  
Discounts and allowances 3,300,000 2,200,000  
Accounts receivable and prepaid and other current assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Discounts and allowances 434,000 467,000  
Chargebacks, Discounts and Fees      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance 2,461,000 1,293,000  
Provision related to current period sales 1,952,000 1,487,000  
Credit or payments made during the period (2,727,000) (1,324,000)  
Balance 1,686,000 1,456,000  
Government and Other Rebates      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance 2,115,000 1,801,000  
Provision related to current period sales 1,146,000 745,000  
Credit or payments made during the period (988,000) (627,000)  
Balance 2,273,000 1,919,000  
Returns      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance 1,489,000 238,000  
Provision related to current period sales 201,000    
Credit or payments made during the period (243,000) (58,000)  
Balance $ 1,447,000 $ 180,000