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Subsequent events - Narrative (Details) $ in Thousands	Aug. 04, 2019 USD ($) Feet Term	Aug. 02, 2019	Jun. 30, 2019 USD ($)
Subsequent Event [Line Items]
Aggregate rent, Initial term			$ 11,195
Subsequent Event
Subsequent Event [Line Items]
Square feet of office | Feet	185,000
Term of Contract ( in years )	15 years
Number of terms | Term	2
Aggregate rent, Initial term	$ 88,000
Percent Of Market Rate	95.00%
Renewal Term (in years)		10 years
Letters of Credit	$ 7,500
Term for letter of credit (in years)	5 years
Fifth Anniversary [Member] | Subsequent Event
Subsequent Event [Line Items]
Letters of Credit	$ 3,800
New Building | Subsequent Event
Subsequent Event [Line Items]
Square feet of office | Feet	75,000
Term of Contract ( in years )	15 years
Number of terms | Term	2
Renewal Term (in years)		5 years

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Feet

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Number of terms

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Percent Of Market Rate

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- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Term of lessee's 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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