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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, 2017 | Sep. 30, 2016
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 2,226 |
Granted (in shares) | 400 |
Cancelled (in shares) | (397) |
Outstanding at the end of the period (in shares) | 2,229 | 2,226
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 1.43 |
Granted (in dollars per share) | 5.94 |
Exercised (in dollars per share) | 3.00 |
Outstanding at the end of the period (in dollars per share) | $ 3.66 | $ 1.43
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 6 years 6 months | 5 years 9 months 18 days
Aggregate Intrinsic Value |  |
Outstanding at the beginning of the period (in dollars) | $ 7,581 |
Outstanding at the end of the period (in dollars) | $ 7,490 | $ 7,581
Employee Stock Option |  |
Aggregate Intrinsic Value |  |
Average yield | 2.46% |
Contractual and expected life of grants | 10 years |
Price volatility | 12.00% |
Maximum | Employee Stock Option |  |
Aggregate Intrinsic Value |  |
Vair value share price (in dollars per share) | $ 0.93 |
Minimum | Employee Stock Option |  |
Aggregate Intrinsic Value |  |
Vair value share price (in dollars per share) | $ 1.47 |

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