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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
A significant customer is a biopharmaceutical customer or a clinical testing payer 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:
RevenueAccounts Receivable, Net
Year Ended December 31,As of December 31,
20212020201920212020
Customer A
*10 %26 %*11 %
Customer B
29 %25 %14 %13 %13 %
Customer C
***10 %12 %
Customer D****11 %
Customer E***13 %*
*    less than 10%
Contractual Receivables, Allowance For Credit Loss The following table presents the receivable and the related credit loss amounts:
Gross AmountAllowance for Credit LossesNet Amount
December 31, 2021December 31, 2020
Year Ended December 31, 2021
December 31, 2021December 31, 2020
Beginning BalanceCharged to (Reversed from) Other Income (Expense), NetReclassi
fication
Ending Balance
(in thousand)
Prepaid expenses and other current assets
$— $— $— $1,100 $(1,100)$— $— $— 
Other assets
5,900 7,000 (7,000)— 1,100 (5,900)— — 
Property, Plant and Equipment
Estimated useful lives for property and equipment are as follows:
Property and EquipmentEstimated Useful Life
Machinery and equipment
3 – 5 years
Furniture and fixtures
7 years
Computer hardware and computer software
3 years
Leasehold improvementsLesser of estimated useful life or remaining lease term
Property and equipment, net consist of the following:
As of December 31,
20212020
(in thousands)
Machinery and equipment
$63,022 $40,216 
Leasehold improvements
38,702 34,037 
Computer hardware
16,685 10,862 
Construction in progress(1)
55,873 7,833 
Furniture and fixtures
3,683 3,043 
Computer software
1,320 1,136 
Property and equipment, gross
$179,285 $97,127 
Less: accumulated depreciation
(54,824)(34,345)
Property and equipment, net
$124,461 $62,782 
(1)    Under construction in progress, $45.8 million and $1.1 million was related to leasehold improvements, furniture and equipment for the office in Palo Alto, California, as of December 31, 2021 and 2020, respectively.