Assets - Other Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Other Investment
Change in observable market prices	$ 0
Kateeva
Other Investment
Carrying value of investment	21,000	$ 21,000
Separate non-marketable investment
Other Investment
Amount of investment made	$ 3,500	$ 3,500
Separate non-marketable investment \| Maximum
Other Investment
Percentage ownership of cost method investee	20.00%

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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- Definition

Amount of change in observable market prices for investments of the entity.

+ References

No definition available.

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- Definition

The percentage of ownership in the investee accounted for under the cost method of accounting.

+ References

No definition available.

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