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Revenue from Contracts with Customers (Details 3) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Deferred Revenue, Current |  | $ 5,021 | $ 5,815
Deferred Revenue, Noncurrent |  | 3,504 | 2,483
Movement in Deferred Revenue [Roll Forward] |  |  |
Beginning balance | $ 7,787 |  |
Increase in deferred revenue representing our obligation to satisfy future performance obligations | 14,650 |  |
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations | (13,755) |  |
Foreign currency fluctuations | (157) |  |
Ending balance | 8,525 |  |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
2019 |  | 5,021 |
2020 |  | 1,865 |
2021 |  | 1,044 |
2022 |  | 442 |
2023 |  | 153 |
Thereafter |  | 0 |
Total | $ 7,787 | $ 8,525 | $ 7,787
Prepaid Maintenance Contract Duration, Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Standard Prepaid Maintenance Contract Time Period | 12 months |  |
Prepaid Maintenance Contract Duration, Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Standard Prepaid Maintenance Contract Time Period | 60 months |  |

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- Definition Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of revenue to be recognized for future performance obligations satisfied for which consideration from customer has been received or is due in the third fiscal year following the latest fiscal year. + References No definition available. + Details
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