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Product Revenues, Net (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Product Revenues By Geographic Location
The following table presents a geographic summary of the Company's product revenues, net for the years ended December 31, 2023 and 2022 (in thousands).
For the Year Ended December 31,
20232022
US$224,195 $185,994 
Japan65,733 56,506 
Europe and rest of world15,280 2,858 
  Total product revenues, net$305,208 $245,358 
Schedule of Contract with Customer, Asset, Allowance for Credit Loss
The following table provides a summary rollforward of the Company's sales allowances and related accruals for the years ended December 31, 2023 and 2022, which have been deducted in arriving at product revenues, net (in thousands).
Customer Credits, Fees and DiscountsRebates, Chargebacks and Co-pay AssistanceTotal
Balance as of December 31, 2022$14,232 $5,564 $19,796 
Allowances for current period sales12,494 33,834 46,328 
Allowances for prior period sales— (118)(118)
Payments and credits(11,244)(29,103)(40,347)
Balance as of December 31, 2023$15,482 $10,177 $25,659 
Balance as of December 31, 2021$3,122 $5,276 $8,398 
Allowances for current period sales13,125 23,737 36,862 
Allowances for prior period sales5,787 (471)5,316 
Payments and credits(7,802)(22,978)(30,780)
Balance as of December 31, 2022$14,232 $5,564 $19,796