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Revenues | 3 Months Ended
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Mar. 31, 2019
Revenues Disclosure [Abstract] |
Revenues | 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 three months ended March 31, 2019 and 2018 consist of:
|  | Three Months Ended March 31, 2019
|  | (in thousands)
|  | United States |  |  | United Kingdom |  |  | Germany |  |  | Rest of the world |  | Total
Instruments, equipment, software and accessories | $ | 18,671 |  | $ | 3,129 |  | $ | 2,913 |  | $ | 2,044 | $ | 26,757
Service, maintenance and warranty contracts |  | 1,143 |  |  | 190 |  |  | 97 |  |  | 15 |  | 1,445
Total revenues | $ | 19,814 |  | $ | 3,319 |  | $ | 3,010 |  | $ | 2,059 | $ | 28,202
|  | Three Months Ended March 31, 2018
|  | (in thousands)
|  | United States |  |  | United Kingdom |  |  | Germany |  |  | Rest of the world |  | Total
Instruments, equipment, software and accessories | $ | 16,147 |  | $ | 3,495 |  | $ | 3,707 |  | $ | 2,255 | $ | 25,604
Service, maintenance and warranty contracts |  | 896 |  |  | 201 |  |  | 52 |  |  | 6 |  | 1,155
Total revenues | $ | 17,043 |  | $ | 3,696 |  | $ | 3,759 |  | $ | 2,261 | $ | 26,759
Deferred revenue As of March 31, 2019 and December 31, 2018, the Company had approximately $3.7 million and $3.8 million, respectively, in deferred revenue comprised of revenue deferred from service contracts and revenue deferred from advance payments. Changes in defe r r ed revenue from service contracts and advance payments from customers during the three months ended March 31, 2019 and 2018 were as follows:
|  | Three Months Ended March 31, 2019
|  | (in thousands) |  |  |  |  |  |
|  | Service Contracts |  |  | Customer Advances |  |  | Total
Balance at December 31, 2018 | $ | 1,659 |  | $ | 2,161 |  | $ | 3,820
Deferral of revenue |  | 845 |  |  | 111 |  |  | 956
Recognition of deferred revenue |  | (848) |  |  | (223) |  |  | (1,071)
Effect of foreign currency translation |  | 10 |  |  | - |  |  | 10
Balance at March 31, 2019 | $ | 1,666 |  | $ | 2,049 |  | $ | 3,715
|  | Three Months Ended March 31, 2018
|  | (in thousands) |  |  |  |  |  |
|  | Service Contracts |  |  | Customer Advances |  |  | Total
Balance at December 31, 2017 | $ | 505 |  | $ | - |  | $ | 505
Addition due to business combination |  | 849 |  |  | 2,128 |  |  | 2,977
Deferral of revenue |  | 1,193 |  |  | 128 |  |  | 1,321
Recognition of deferred revenue |  | (758) |  |  | (196) |  |  | (954)
Effect of foreign currency translation |  | 4 |  |  | - |  |  | 4
Balance at March 31, 2018 | $ | 1,793 |  | $ | 2,060 |  | $ | 3,853
Allowance for doubtful accounts Activity in the allowance for doubtful accounts was as follows:
|  | Three Months Ended March 31,
|  | 2019 |  | 2018
|  | (in thousands)
Balance, beginning of period | $ | 332 | $ | 193
Bad debt expense (recoveries) |  | (16) |  | 5
Charged to allowance |  | 27 |  | -
Other |  | - |  | 36
Effect of foreign currency translation |  | (2) |  | -
Balance, end of period | $ | 341 | $ | 234

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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