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Business overview and basis of presentation (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 06, 2018 USD ($) $ / shares shares | Jul. 19, 2018 | Jun. 30, 2018 USD ($) country | Jul. 01, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |
Number of countries where products are distributed | country |  |  | 50 |
Underwriting discounts and commissions | $ |  |  | $ 2,154 | $ 0
Subsequent Event |  |  |  |
Class of Stock [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 |  |
IPO | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 6,388,888 |  |  |
Public offering price (in USD per share) | $ / shares | $ 15.00 |  |  |
Net proceeds from IPO | $ | $ 90,600 |  |  |
Underwriting discounts and commissions | $ | 5,300 |  |  |
Offering costs | $ | $ 4,600 |  |  |
Over-Allotment Option | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 833,333 |  |  |
Initial Public Offering - Shares From Existing Shareholders | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 9,583,333 |  |  |
Over-Allotment Option - Shares From Existing Shareholders | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 1,250,000 |  |  |

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