Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Schedules of Concentration of Risk, by Risk Factor

A significant customer is any biopharmaceutical customer, clinical testing payer, or international laboratory partner that represents 10% or more of the Company’s total revenue or accounts receivable balance. Revenue attributable to each significant customer, including its affiliated entities, as a percentage of the Company’s total revenue, for the respective period, and accounts receivable balance attributable to each significant customers, including its affiliated entities, as a percentage of the Company’s total accounts receivable balance, at the respective consolidated balance sheet date, are as follows:


	Revenue						Accounts Receivable, Net
	Year Ended December 31,						As of December 31,
	2023		2022		2021		2023		2022

Customer A	*		*		*		12	%	12	%
Customer B	31	%	30	%	29	%	12	%	11	%
Customer C	*		*		*		10	%	*

* less than 10%

Schedule of Contractual Receivables, Allowance For Credit Loss

The following table presents the receivable and the related credit loss amounts:


	As of December 31,
	2023		2022

	(in thousands)
Prepaid expenses and other current assets:
Gross Amount	$	—	$	—
Allowance for Credit Losses	—		—
Net Amount	$	—	$	—
Other assets:
Gross Amount	$	3,700	$	4,800
Allowance for Credit Losses	(3,700)		(4,800)
Net Amount	$	—	$	—

The following table summarizes the allowance for credit losses activities for the years ended December 31, 2023, 2022 and 2021:


	Year Ended December 31,
	2023		2022		2021

	(in thousands)
Prepaid expenses and other current assets:
Allowance for credit losses—Beginning of period	$	—	$	—	$	—
Charged to (reversed from) other income (expense), net	(1,100)		(1,100)		(1,100)
Reclassification	1,100		1,100		1,100
Allowance for credit losses—End of period	$	—	$	—	$	—
Other assets:
Allowance for credit losses—Beginning of period	$	4,800	$	5,900	$	7,000

Reclassification	(1,100)		(1,100)		(1,100)
Allowance for credit losses—End of period	$	3,700	$	4,800	$	5,900

Schedule of Property, Plant and Equipment

Estimated useful lives for property and equipment are as follows:


Property and Equipment						Estimated Useful Life

Machinery and equipment						5 years
Furniture and fixtures						7 years
Computer hardware and computer software						3 years
Leasehold improvements						Lesser of estimated useful life or remaining lease term

Property and equipment, net consist of the following:


	As of December 31,
	2023		2022

	(in thousands)
Machinery and equipment	$	118,117	$	95,764
Leasehold improvements	102,298		99,781
Computer hardware	34,417		29,744
Construction in progress	7,508		20,598
Furniture and fixtures	7,999		8,367
Computer software	2,065		1,797
Property and equipment, gross	$	272,404	$	256,051
Less: accumulated depreciation	(127,308)		(88,131)
Property and equipment, net	$	145,096	$	167,920