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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 2,134 |
Granted (in shares) | 35 |
Exercised (in shares) | (35) |
Outstanding at the end of the period (in shares) | 2,134 | 2,134
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 4.31 |
Granted (in dollars per share) | 5.25 |
Exercised (in dollars per share) | 1.12 |
Outstanding at the end of the period (in dollars per share) | $ 4.36 | $ 4.31
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 6 years | 6 years 3 months 18 days
Aggregate Intrinsic Value |  |
Outstanding at the beginning of the period (in dollars) | $ 6,949 |
Outstanding at the end of the period (in dollars) | $ 5,755 | $ 6,949

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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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