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Product Revenues, Accounts Receivable, and Reserves for Product Sales (Tables)

12 Months Ended

Dec. 31, 2023

Product Revenues Accounts Receivable And Reserves For Product Sales [Abstract]

Schedule of Disaggregation of Product Revenue by Major Source

The table reflects product revenue by major source for the following periods (in thousands):

		Year Ended December 31,
		2023				2022				2021
Products:
EMPAVELI		$	91,033			$	65,092			$	15,147
SYFOVRE			275,248				—				—
Total product revenue, net		$	366,281			$	65,092			$	15,147

Summary of Product Revenue Allowance and Reserve Categories

The following table summarizes activity in each of the product revenue allowance and reserve categories as of December 31, 2023 (in thousands):

		Chargebacks, Discounts, and Fees				Government and other rebates				Returns				Total
Ending balance at December 31, 2021		$	67			$	716			$	167			$	951
Provision related to sales in the current year			614				4,569				1,185				6,368
Adjustments related to prior period sales			(156	)			(246	)			(385	)			(787	)
Credits and payments made			(362	)			(3,103	)			(716	)			(4,181	)
Ending balance at December 31, 2022		$	164			$	1,936			$	251			$	2,351
Provision related to sales in the current year			17,690				26,661				4,698				49,050
Adjustments related to prior period sales			(112	)			(1,223	)			(2,481	)			(3,817	)
Credits and payments made			(12,068	)			(18,476	)			(415	)			(30,960	)
Ending balance at December 31, 2023		$	5,674			$	8,898			$	2,053			$	16,625

Schedule of Customer Accounted for 10% of More of Gross Product Revenues and Accounts Receivable

Significant customers - Gross product revenues and product sales receivable from the Company's customers who individually accounted for 10% of more of total gross product revenues and/or 10% or more of total product sales receivable consisted of the following:

		Percent of Total Gross Product Revenues
		Year Ended December 31,
		2023		2022				2021
Customer A		24%		99%				99%
Customer C		16%			—				—
Customer D		54%		1%					—

		Percent of Product Sales Receivable
		As of December 31,
		2023		2022
Customer A		4%		96%
Customer C		22%		3%
Customer D		66%			—

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- Definition

Product revenue reserves and allowances.

+ References

No definition available.

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- Definition

Product revenues, accounts receivable, and reserves for product sales.

+ References

No definition available.

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

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Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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