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Product Revenue and Reserves for Variable Consideration
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Product Revenue and Reserves for Variable Consideration Product Revenue and Reserves for Variable Consideration
To date, the Company’s only source of product revenue has been from the U.S. sales of Auryxia. Total net product revenue was $41.4 million and $30.4 million for the three months ended March 31, 2022 and 2021, respectively. The following table summarizes activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2022 and 2021 (in thousands):
 
 Chargebacks
and Discounts		Rebates, Fees
and other
Deductions		ReturnsTotal
Balance at December 31, 2021$1,278 $26,625 $475 $28,378 
Current provisions related to sales in current year2,711 21,324 1,359 25,394 
Adjustments related to prior year sales(132)779 — 647 
Credits/payments made(2,465)(22,491)(1,293)(26,249)
Balance at March 31, 2022$1,392 $26,237 $541 $28,170 
Balance at December 31, 2020$802 $39,912 $649 $41,363 
Current provisions related to sales in current year3,170 33,643 2,152 38,965 
Adjustments related to prior year sales3 (1,241)— (1,238)
Credits/payments made(2,646)(29,098)(1,917)(33,661)
Balance at March 31, 2021$1,329 $43,216 $884 $45,429 
 
Chargebacks, discounts and returns are recorded as a direct reduction of revenue on the unaudited condensed consolidated statement of operations with a corresponding reduction to accounts receivable on the unaudited condensed consolidated balance sheets. Rebates, distribution-related fees, and other sales-related deductions are recorded as a reduction in revenue on the unaudited condensed consolidated statement of operations with a corresponding increase to accrued liabilities or accounts payable on the unaudited condensed consolidated balance sheets.

Accounts receivable, net related to product sales was approximately $27.7 million and $24.6 million as of March 31, 2022 and December 31, 2021, respectively.