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Stockholders' Equity - Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Number of Shares |  |  |  |
Beginning balance (in shares) | 2,806,364 | 2,845,866 | 3,015,374 |
Granted (in shares) | 409,368 | 299,397 | 147,800 |
Exercised (in shares) | (1,384,647) | (250,823) | (235,514) |
Canceled (in shares) | (144,183) | (88,076) | (81,794) |
Ending balance (in shares) | 1,686,902 | 2,806,364 | 2,845,866 | 3,015,374
Weighted- Average Exercise Price Per Share |  |  |  |
Beginning balance (in dollars per share) | $ 4.75 | $ 4.21 | $ 3.95 |
Granted (in dollars per share) | 9.59 | 8.60 | 7.06 |
Exercised (in dollars per share) | 3.25 | 2.96 | 2.92 |
Cancelled (in dollars per share) | 6.62 | 5.23 | 3.59 |
Ending balance (in dollars per share) | $ 7.00 | $ 4.75 | $ 4.21 | $ 3.95
Additional Disclosures [Abstract] |  |  |  |
Weighted- Average Remaining Contractual Term (in Years) | 5 years 4 months 24 days | 4 years 7 months 6 days | 5 years 4 months 24 days | 6 years 4 months 24 days

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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