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The Company, Business Activities and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2019

Composition of Net Revenues Recognized Disaggregated by Source and Nature

The composition of the Company’s net revenues recognized during the three months ended March 31, 2018 and 2019 disaggregated by source and nature are as follows:

	For the three months ended March 31,
	2018		2019
Net revenues from contracted payers*	$	337,946	$	481,420
Net revenues from non-contracted payers		424,363		500,321
Development services revenues		44,634		42,498
Total net revenues	$	806,943	$	1,024,239

*Includes Medicare and Medicare Advantage, as reimbursement amounts are fixed. Also includes other income from sales of CEE-Sure blood collection tubes and research-use-only (RUO) test kits.

	For the three months ended March 31,
	2018		2019
Net commercial revenues recognized upon delivery	$	762,309	$	893,938
Development services revenues recognized upon delivery		44,634		42,498
Commercial revenues recognized upon cash collection		—		87,803
Total net revenues	$	806,943	$	1,024,239

Summary of Third-Party Payers That Represent More Than 10% of Total Net Revenues and Total Net Accounts Receivable and Their Related Percentage

The Company's third-party payers that represent more than 10% of total net revenues in any period presented, as well as their related net revenue amount as a percentage of total net revenues, during the three months ended March 31, 2018 and 2019 were as follows:

	For the three months ended March 31,
	2018			2019
Medicare and Medicare Advantage		39	%		45	%
Blue Cross Blue Shield		22	%		14	%
United Healthcare		22	%		12	%

The Company's third-party payers that represent more than 10% of total net accounts receivable, and their related net accounts receivable balance as a percentage of total net accounts receivable, at December 31, 2018 and March 31, 2019 were as follows:

	December 31, 2018			March 31, 2019
Blue Cross Blue Shield		22	%		22	%
Medicare and Medicare Advantage		17	%		19	%
United Healthcare		15	%		16	%