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Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 2,134 |
Granted (in shares) | 0 |
Exercised (in shares) | (35) |
Outstanding at the end of the period (in shares) | 2,099 | 2,134
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 4.31 |
Granted (in dollars per share) | 0.00 |
Exercised (in dollars per share) | 1.12 |
Outstanding at the end of the period (in dollars per share) | $ 4.33 | $ 4.31
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 6 years 2 months 12 days | 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) | $ 5,103 | $ 6,949

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