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Revenue from Contracts with Customers (Details 3) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Deferred Revenue, Current |  | $ 5,064 | $ 5,304
Deferred Revenue, Noncurrent |  | 3,140 | 2,483
Movement in Deferred Revenue [Roll Forward] |  |  |
Beginning balance | $ 7,787 |  |
Increase in deferred revenue representing our obligation to satisfy future performance obligations | 11,032 |  |
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations | (10,475) |  |
Foreign currency fluctuations | (140) |  |
Ending balance | 8,204 |  |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
Remaining 2018 |  | 2,502 |
2019 |  | 2,958 |
2020 |  | 1,595 |
2021 |  | 692 |
2022 |  | 381 |
Thereafter |  | 76 |
Total | $ 7,787 | $ 8,204 | $ 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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