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Nature of Operations and Summary of Significant Accounting Policies - Potentially Dilutive Common Shares Excluded from Calculation of Net Loss per Share (Detail) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 5,410 | 715 | 5,410 | 689
IDchecker | Closing shares |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 0 | 32 | 0 | 37
IDchecker | Earnout shares |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 0 | 47 | 0 | 47
Stock options |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 2,871 | 582 | 2,871 | 587
RSUs |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 2,476 | 54 | 2,476 | 18
Employee Stock Purchase Plan |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Total potentially dilutive common shares outstanding (in shares) | 63 | 0 | 63 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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