Revenues

6 Months Ended

Jun. 30, 2019

17. Revenues

The following table represents a disaggregation of revenue from contracts with customers. Revenue from continuing operations originating from the following geographic areas for the six months ended June 30, 2019 and 2018 consist of:

	Three Months Ended June 30, 2019
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment, software and accessories	$	20,920	$	2,399	$	3,271	$	1,753	$	28,343
Service, maintenance and warranty contracts		910		236		79		16		1,241
Total revenues	$	21,830	$	2,635	$	3,350	$	1,769	$	29,584


	Three Months Ended June 30, 2018
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment, software and accessories	$	20,478	$	4,058	$	3,316	$	2,156	$	30,008
Service, maintenance and warranty contracts		1,204		168		129		13		1,514
Total revenues	$	21,682	$	4,226	$	3,445	$	2,169	$	31,522


	Six Months Ended June 30, 2019
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment and accessories	$	39,591	$	5,528	$	6,184	$	3,798	$	55,101
Service, maintenance and warranty contracts		2,053		426		176		30		2,685
Total revenues	$	41,644	$	5,954	$	6,360	$	3,828	$	57,786


	Six Months Ended June 30, 2018
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment and accessories	$	36,695	$	7,587	$	7,006	$	4,400	$	55,688
Service, maintenance and warranty contracts		2,030		334		198		31		2,593
Total revenues	$	38,725	$	7,921	$	7,204	$	4,431	$	58,281

Deferred revenue

As of June 30, 2019 and December 31, 2018, the Company had approximately $3.5 million and $3.8 million, respectively, in deferred revenue comprised of revenue deferred from service contracts and revenue deferred from advance payments.

Changes in deferred revenue from service contracts and advance payments from customers during the six months ended June 30, 2019 and 2018 were as follows:

	Three Months Ended June 30, 2019
	(in thousands)
	Service Contracts		Customer Advances		Total
Balance at March 31, 2019	$	1,666	$	2,049	$	3,715
Deferral of revenue		281		140		421
Recognition of deferred revenue		(344)		(250)		(594)
Effect of foreign currency translation		(10)		-		(10)
Balance at June 30, 2019	$	1,593	$	1,939	$	3,532


	Three Months Ended June 30, 2018
	(in thousands)
	Service Contracts		Customer Advances		Total
Balance at March 31, 2018	$	1,793	$	2,060	$	3,853
Addition due to business combination		(1)		-		(1)
Deferral of revenue		1,090		116		1,206
Recognition of deferred revenue		(1,169)		(323)		(1,492)
Effect of foreign currency translation		(19)		-		(19)
Balance at June 30, 2018	$	1,694	$	1,853	$	3,547


	Six Months Ended June 30, 2019
	(in thousands)
	Service Contracts		Customer Advances		Total
Balance at December 31, 2018	$	1,659	$	2,161	$	3,820
Deferral of revenue		1,126		251		1,377
Recognition of deferred revenue		(1,192)		(473)		(1,665)
Effect of foreign currency translation		-		-		-
Balance at June 30, 2019	$	1,593	$	1,939	$	3,532


	Six Months Ended June 30, 2018
	(in thousands)
	Service Contracts		Customer Advances		Total
Balance at December 31, 2017	$	505	$	-	$	505
Addition due to business combination		848		2,128		2,976
Deferral of revenue		2,283		244		2,527
Recognition of deferred revenue		(1,927)		(519)		(2,446)
Effect of foreign currency translation		(15)		-		(15)
Balance at June 30, 2018	$	1,694	$	1,853	$	3,547

Allowance for doubtful accounts

Activity in the allowance for doubtful accounts was as follows:

	Six Months Ended June 30,
		2019		2018
		(in thousands)

Balance, beginning of period	$	332	$	193
Addition due to business combination		-		102
Bad debt expense		368		149
Charge-offs and other recoveries		(329)		-
Effect of foreign currency translation		(1)		77
Balance, end of period	$	370	$	521