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Revenue (Tables)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue Allowance and Accrual Activities

An analysis of the changes in product revenue allowances and reserves is summarized as follows:

 

(in thousands):  Returns   Co-pay assistance  program   Prompt pay discounts   Government and payor rebates   Total 
Balance at December 31, 2020  $217   $52   $15   $43   $327 
Provision related to current period sales   1    87    3    23    114 
Credit or payments made during the period   (120)   (88)   (2)   (25)   (235)
Balance at March 31, 2021  $98   $51   $16   $41   $206 
                          
Balance at December 31, 2021  $43   $101   $48   $54   $246 
Provision related to current period sales   3    165    5    45    218 
Credit or payments made during the period   (5)   (150)   (17)   (52)   (224)
Balance at March 31, 2022  $41   $116   $36   $47   $240