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Revenue from Contracts with Customers (Details 3) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Deferred Revenue, Noncurrent |  | $ 3,329 | $ 2,483
Deferred Revenue, Current |  | 4,896 | 5,304
Movement in Deferred Revenue [Roll Forward] |  |  |
Beginning balance | $ 7,787 |  |
Increase in deferred revenue representing our obligation to satisfy future performance obligations | 7,475 |  |
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations | (6,951) |  |
Foreign currency fluctuations | (86) |  |
Ending balance | 8,225 |  |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
Remaining 2018 |  | 2,984 |
2019 |  | 3,092 |
2020 |  | 1,280 |
2021 |  | 562 |
2022 |  | 277 |
Thereafter |  | 30 |
Total | $ 7,787 | $ 8,225 | $ 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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