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Subsequent events (Details) - Subsequent Event | Aug. 06, 2018 shares | Jul. 19, 2018 | Jul. 31, 2018 USD ($)
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Common shares issued in conversion of outstanding shares of redeemable convertible preferred stock (shares) | 32,482,590 |  |
Number of shares of common stock issued for each share of redeemable convertible preferred stock (shares) | 1 |  |
Stock split, conversion ratio |  | 2 |
J.P. Morgan Chase Bank, N.A. | Term Loan under Credit Facility |  |  |
Subsequent Event [Line Items] |  |  |
Debt | $ |  |  | $ 40,000,000

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