Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Summary of Significant Accounting Policies | ||
| Net Receivables, Opening balance | $ 15,321 | $ 11,065 |
| Net Receivables, Closing balance | 16,285 | 12,359 |
| Increase/(decrease) | 964 | 1,294 |
| Contract Liabilities, Current, Opening balance | 18 | 31 |
| Contract Liabilities, Current, Closing balance | 19 | 27 |
| Increase/(decrease) | 1 | (4) |
| Contract Liabilities, Long-Term, Opening balance | 42 | 68 |
| Contract Liabilities, Long-Term, Closing balance | 29 | 55 |
| Increase/(decrease) | $ (13) | $ (13) |
| X | ||||||||||
- Definition Increase (Decrease) in Contract Receivable No definition available.
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| X | ||||||||||
- Definition Increase (Decrease) in Contract with Customer, Liability, Current No definition available.
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| X | ||||||||||
- Definition Increase (Decrease) in Contract with Customer, Liability, Noncurrent No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract. 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://www.xbrl.org/2003/role/disclosureRef
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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://www.xbrl.org/2003/role/disclosureRef
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