Deferred Revenue - Classification of Deferred Revenue (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
Jan. 01, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|
| Revenue from Contract with Customer [Abstract] | ||||
| Current portion | $ 39,180 | $ 30,694 | $ 20,164 | |
| Long term portion | 1,881 | 1,352 | $ 922 | |
| Deferred revenue | $ 41,061 | $ 32,046 | $ 21,086 |
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| 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
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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