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Leases - Supplemental Information Related to Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Operating leases |  |  |  |  |
Weighted average remaining lease term | 3 years 4 months 24 days |  | 3 years 4 months 24 days |  | 3 years 1 month 6 days
Weighted average discount rate | 6.80% |  | 6.80% |  | 7.10%
ROU assets obtained in exchange for lease obligations |  |  |  |  |
Operating leases | $ 0 | $ 1,262 | $ 2,198 | $ 1,262 |
Finance leases | $ 0 | $ 0 | $ 11 | $ 0 |

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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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