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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 1,994 |
Granted (in shares) | 217 |
Exercised (in shares) | (42) |
Outstanding at the end of the period (in shares) | 2,169 | 1,994
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 3.83 |
Granted (in dollars per share) | 6.33 |
Exercised (in dollars per share) | 1.69 |
Outstanding at the end of the period (in dollars per share) | $ 4.38 | $ 3.83
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 6 years 22 days | 6 years 4 months 24 days
Aggregate Intrinsic Value |  |
Outstanding at the beginning of the period (in dollars) | $ 8,489 |
Outstanding at the end of the period (in dollars) | $ 7,093 | $ 8,489

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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