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Revenues | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue from Contract with Customer [Text Block] | 19. 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 years ended December 31, 2018 and 2017 consist of:
|  | Year Ended December 31, 2018
|  | (in thousands)
|  | United States |  |  | United Kingdom |  |  | Germany |  |  | Rest of the world |  | Total
Instruments, equipment, software and accessories | $ | 79,614 |  | $ | 13,690 |  | $ | 13,193 |  | $ | 8,571 | $ | 115,068
Service, maintenance and warranty contracts |  | 4,438 |  |  | 832 |  |  | 366 |  |  | 70 |  | 5,706
Total revenues | $ | 84,052 |  | $ | 14,522 |  | $ | 13,559 |  | $ | 8,641 | $ | 120,774
|  | Year Ended December 31, 2017
|  | (in thousands)
|  | United States |  |  | United Kingdom |  |  | Germany |  |  | Rest of the world |  | Total
Instruments, equipment, software and accessories | $ | 40,240 |  | $ | 14,224 |  | $ | 10,766 |  | $ | 9,392 | $ | 74,622
Service, maintenance and warranty contracts |  | 1,481 |  |  | 819 |  |  | 396 |  |  | 89 |  | 2,785
Total revenues | $ | 41,721 |  | $ | 15,043 |  | $ | 11,162 |  | $ | 9,481 | $ | 77,407
Deferred revenue As of December 31, 2018, the Company had approximately $3.8 million 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 period were as follows:
|  | Year Ended December 31, 2018
|  | (in thousands) |  |  |  |  |  |
|  | Service Contracts |  |  | Customer Advances |  |  | Total
Balance, beginning of period | $ | 505 |  | $ | - |  | $ | 505
Addition due to business combination |  | 848 |  |  | 2,128 |  |  | 2,976
Deferral of revenue |  | 4,305 |  |  | 1,210 |  |  | 5,515
Recognition of deferred revenue |  | (3,984) |  |  | (1,177) |  |  | (5,161)
Effect of foreign currency translation |  | (15) |  |  | - |  |  | (15)
Balance, end of period | $ | 1,659 |  | $ | 2,161 |  | $ | 3,820
Acquisition of DSI As discussed in Note 5, the Company acquired DSI, a previously privately held company on January 31, 2018. The Company has adopted ASC 606 with respect to DSI as of January 31, 2018. The tables, revenue recognition policies applied, and product descriptions noted above are thus inclusive of, and reflect revenues of DSI for the periods from the acquisition date.

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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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