Leases - Lease cost - Other information (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Leases
Weighted-average remaining lease term - finance lease (in years)	4 years 8 months 12 days
Weighted-average remaining lease term - operating leases (in years)	1 year 8 months 12 days
Weighted-average discount rate - finance lease (as a percent)	5.00%
Weighted-average discount rate - operating leases (as a percent)	5.00%
Cash paid for amounts included in the measurement of lease liabilities
Financing cash flows from finance leases	$ 14

No definition available.

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- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

Weighted average remaining lease term for finance 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
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- References

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Weighted average discount rate for operating lease calculated at point in time.

+ References

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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

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-Subparagraph (g)(3)
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