Revenue from contracts with customers

6 Months Ended

12 Months Ended

Jun. 30, 2019

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from contracts with customers

Note 4 – Revenue from contracts with customers

Disaggregated revenue

The Company provides diagnostic test products, laboratory services to hospitals, clinical laboratories and other healthcare provider customers, and enters into collaboration agreements with government agencies and healthcare providers. The revenues by type of service consist of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Product sales	$	504,293	$	632,525	$	1,024,470	$	1,266,021
Laboratory services		5,250		1,100		5,250		9,790
Collaboration revenue		500,000		155,276		1,000,000		359,316
Total revenue	$	1,009,543	$	788,901	$	2,029,720	$	1,635,127

Deferred revenue

Changes in deferred revenue for the period were as follows:

Balance at December 31, 2018	$	15,824
Revenue recognized in the current period from the amounts in the beginning balance		(5,831	)
New deferrals, net of amounts recognized in the current period		—
Balance at June 30, 2019	$	9,993

Contract assets

The Company had no contract assets as of June 30, 2019, which are generated when contractual billing schedules differ from revenue recognition timing. Contract assets represent a conditional right to consideration for satisfied performance obligations that becomes a billed receivable when the conditions are satisfied.

Unsatisfied performance obligations

Remaining contract consideration for which revenue has not been recognized due to unsatisfied performance obligations was $575,000 at June 30, 2019, which the Company expects to recognize over the next six months.

Note 4 - Revenue from Contracts with Customers

Disaggregated Revenue

The Company provides diagnostic test products, laboratory services to hospitals, clinical laboratories and other healthcare provider customers, and enters into collaboration agreements with government agencies and healthcare providers. The revenues by type of service consist of the following:

	December 31,
	2018		2017
Product sales	$	2,395,626	$	2,771,869
Laboratory services		34,665		41,960
Collaboration revenue		516,016		397,178
Total revenue	$	2,946,307	$	3,211,007

Deferred Revenue

Changes in deferred revenue for the period were as follows:

Balance at December 31, 2017	$	24,442
Revenue recognized in the current period from the amounts in the beginning balance		(14,450	)
New deferrals, net of amounts recognized in the current period		5,832
Balance at December 31, 2018	$	15,824

Contract Assets

The Company had no contract assets as of December 31, 2018, which are generated when contractual billing schedules differ from revenue recognition timing. Contract assets represent a conditional right to consideration for satisfied performance obligations that becomes a billed receivable when the conditions are satisfied.

Unsatisfied Performance Obligations

The Company had no unsatisfied performance obligations related to its contracts with customers at December 31, 2018.