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Subsequent events - Narrative (Details) $ in Thousands | Aug. 04, 2019 USD ($) Feet Term | Aug. 02, 2019 | Jun. 30, 2019 USD ($)
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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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