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Redeemable convertible preferred stock (Details) - USD ($) $ in Thousands | Aug. 06, 2018 | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Temporary Equity [Line Items] |  |  |
Authorized Shares (in shares) |  | 32,675,074 | 32,675,074
Issued Shares (in shares) |  | 32,482,590 | 32,482,590
Outstanding Shares (in shares) |  | 32,482,590 | 32,482,590
Carrying Value |  | $ 90,341 | $ 90,341
Liquidation Preference |  | $ 90,976 | $ 90,976
Series A Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Authorized Shares (in shares) |  | 10,035,000 | 10,035,000
Issued Shares (in shares) |  | 10,005,000 | 10,005,000
Outstanding Shares (in shares) |  | 10,005,000 | 10,005,000
Carrying Value |  | $ 15,060 | $ 15,060
Liquidation Preference |  | $ 15,008 | $ 15,008
Series B Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Authorized Shares (in shares) |  | 3,881,250 | 3,881,250
Issued Shares (in shares) |  | 3,730,000 | 3,730,000
Outstanding Shares (in shares) |  | 3,730,000 | 3,730,000
Carrying Value |  | $ 5,926 | $ 5,926
Liquidation Preference |  | $ 5,968 | $ 5,968
Series C Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Authorized Shares (in shares) |  | 11,700,000 | 11,700,000
Issued Shares (in shares) |  | 11,688,766 | 11,688,766
Outstanding Shares (in shares) |  | 11,688,766 | 11,688,766
Carrying Value |  | $ 26,556 | $ 26,556
Liquidation Preference |  | $ 25,000 | $ 25,000
Series D Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Authorized Shares (in shares) |  | 7,058,824 | 7,058,824
Issued Shares (in shares) |  | 7,058,824 | 7,058,824
Outstanding Shares (in shares) |  | 7,058,824 | 7,058,824
Carrying Value |  | $ 42,799 | $ 42,799
Liquidation Preference |  | $ 45,000 | $ 45,000
Subsequent Event |  |  |
Temporary Equity [Line Items] |  |  |
Number of shares of common stock issued for each share of redeemable convertible preferred stock (shares) | 1 |  |
Common shares issued in conversion of outstanding shares of redeemable convertible preferred stock (shares) | 32,482,590 |  |

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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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