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Product Revenue and Reserves for Variable Consideration (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Product Revenue Allowance and Reserve Categories The following table summarizes activity in each of the product revenue allowance and reserve categories for the six months ended June 30, 2020 and 2019 (in thousands):
 
 Chargebacks
and Discounts		Rebates, Fees
and other
Deductions		ReturnsTotal
Balance at December 31, 2019$738  $30,552  $253  $31,543  
Current provisions related to sales in current year5,055  66,348  2,684  74,087  
Adjustments related to prior year sales(31) 638  44  651  
Credits/payments made(4,995) (54,945) (2,237) (62,177) 
Balance at June 30, 2020$767  $42,593  $744  $44,104  
Balance at December 31, 2018$516  $22,861  $360  $23,737  
Current provisions related to sales in current year3,306  44,708  1,596  49,610  
Adjustments related to prior year sales(22) 479  —  457  
Credits/payments made(3,320) (46,131) (1,663) (51,114) 
Balance at June 30, 2019$480  $21,917  $293  $22,690