Revenue Recognition - Deferred Revenue and Customer Deposits Rollforward (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Customer Contracts Liability, Current | ||
| Beginning balance | $ 9,420 | $ 7,078 |
| Increases to deferred revenue and customer deposits | 63,231 | 24,985 |
| Recognition of revenue | (61,819) | (23,195) |
| Foreign exchange rate changes | (987) | 552 |
| End balance | $ 9,845 | $ 9,420 |
| X | ||||||||||
- Definition Contract Liability Foreign Exchange Rate Changes No definition available.
|
| X | ||||||||||
- Definition Customer Contracts Liability Current [Roll Forward] No definition available.
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|