Revenue from contracts with customers - Changes in Deferred License Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Revenue recognized during the period | $ 300 | $ 200 | $ 700 | $ 500 |
| Deferred license revenue | ||||
| Deferred revenue, as of December 31, 2018 | 1,179 | |||
| Additions to deferred license revenue | 111 | |||
| Revenue recognized during the period | (100) | |||
| Deferred revenue, as of June 30, 2019 | $ 1,190 | $ 1,190 | ||
| 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 revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| 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
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| X | ||||||||||
- Details
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