Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Roll-Forward of Activity in Allowance for Credit Losses

A roll-forward of the activity in the Company’s allowance for credit losses is as follows:

	December 31,
	2021			2020			2019
	(in thousands)
Allowance for credit losses at beginning of year	$	1,898		$	751		$	590
Impact of ASU 2016-13 adoption		887			—			—
Current period provision		8,931			1,170			189
Write-downs		(499	)		(23	)		(28	)
Allowance for credit losses at end of year	$	11,217		$	1,898		$	751

Accounting Standards Update 2014-09

Summary of Revenue from Contracts with Customers by Payor Type

The following table summarizes revenue from contracts with customers by payor type for the years ended December 31, 2021, 2020 and 2019.

	Year Ended December 31,
	2021		2020		2019
	(in thousands)
Testing Services by payor
Insurance	$	555,762	$	257,587	$	705
Institutional		435,688		163,083		31,284
Patient		1,134		1,042		539
Total Revenue	$	992,584	$	421,712	$	32,528