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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2019
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 2,134,000 |
Granted (in shares) | 250,000 |
Exercised (in shares) | (345,000) |
Cancelled (in shares) | (160,000) |
Outstanding at the end of the period (in shares) | 1,879,000 | 2,134,000
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 4.36 |
Granted (in dollars per share) | 4.17 |
Exercised (in dollars per share) | 1.05 |
Cancelled (in dollars per share) | 1.29 |
Outstanding at the end of the period (in dollars per share) | $ 4.60 | $ 4.36
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 6 years 6 months | 5 years 10 months 24 days
Aggregate Intrinsic Value |  |
Outstanding at the beginning of the period (in dollars) | $ 4,815 |
Outstanding at the end of the period (in dollars) | $ 7,280 | $ 4,815

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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=120381028&loc=d3e5070-113901 + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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