Revenues

9 Months Ended

Sep. 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 nine months ended September 30, 2019 and 2018 consist of:

	Three Months Ended September 30, 2019
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment, software and accessories	$	19,388	$	2,285	$	2,772	$	1,878	$	26,323
Service, maintenance and warranty contracts		822		198		51		24		1,095
Total revenues	$	20,210	$	2,483	$	2,823	$	1,902	$	27,418


	Three Months Ended September 30, 2018
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment, software and accessories	$	19,458	$	3,098	$	2,479	$	2,124	$	27,159
Service, maintenance and warranty contracts		1,077		297		79		23		1,476
Total revenues	$	20,535	$	3,395	$	2,558	$	2,147	$	28,635


	Nine Months Ended September 30, 2019
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment and accessories	$	58,979	$	7,814	$	8,956	$	5,675	$	81,424
Service, maintenance and warranty contracts		2,874		624		227		55		3,780
Total revenues	$	61,853	$	8,438	$	9,183	$	5,730	$	85,204


	Nine Months Ended September 30, 2018
		(in thousands)
	United States		United Kingdom		Germany		Rest of the world		Total
Instruments, equipment and accessories	$	56,153	$	10,685	$	9,485	$	6,524	$	82,847
Service, maintenance and warranty contracts		3,107		631		277		54		4,069
Total revenues	$	59,260	$	11,316	$	9,762	$	6,578	$	86,916

Deferred revenue

As of September 30, 2019 and December 31, 2018, the Company had approximately $3.6 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 nine months ended September 30, 2019 and 2018 were as follows:

(in thousands)	Service Contracts		Customer Advances		Total
Three Months Ended September 30, 2019 and 2018
Balance at June 30, 2019	$	1,593	$	1,939	$	3,532
Deferral of revenue		471		310		781
Recognition of deferred revenue		(358)		(421)		(779)
Effect of foreign currency translation		16		-		16
Balance at September 30, 2019	$	1,722	$	1,828	$	3,550

Balance at June 30, 2018	$	1,694	$	1,853	$	3,547
Deferral of revenue		801		190		991
Recognition of deferred revenue		(1,006)		(274)		(1,280)
Effect of foreign currency translation		9		-		9
Balance at September 30, 2018	$	1,498	$	1,769	$	3,267

Nine Months Ended September 30, 2019 and 2018
Balance at December 31, 2018	$	1,659	$	2,161	$	3,820
Deferral of revenue		1,597		561		2,158
Recognition of deferred revenue		(1,550)		(894)		(2,444)
Effect of foreign currency translation		16		-		16
Balance at September 30, 2019	$	1,722	$	1,828	$	3,550

Balance at December 31, 2017	$	505	$	-	$	505
Addition due to business combination		848		2,128		2,976
Deferral of revenue		3,084		434		3,518
Recognition of deferred revenue		(2,933)		(793)		(3,726)
Effect of foreign currency translation		(6)		-		(6)
Balance at September 30, 2018	$	1,498	$	1,769	$	3,267

Allowance for doubtful accounts

Activity in the allowance for doubtful accounts was as follows:

	Nine Months Ended September 30,
		2019		2018
		(in thousands)

Balance, beginning of period	$	332	$	193
Addition due to business combination		-		102
Bad debt expense		394		3
Charge-offs and other recoveries		(354)		(23)
Effect of foreign currency translation		(8)		26
Balance, end of period	$	364	$	301