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Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Stockholders' Equity |  |  |  |
Shares reserved for issuance (in shares) | 19,100,000 | 19,100,000 |  | 16,300,000
Stock-based compensation expense |  | $ 2.3 |  |
Shares repurchased (in shares) |  | 0 | 0 |
Amount yet to be expended under the program | $ 10.1 | $ 10.1 |  |
Employee Stock Option and Restricted Stock |  |  |  |
Stockholders' Equity |  |  |  |
Stock-based compensation expense |  | 2.4 |  |
Cash-settled stock appreciation rights |  |  |  |
Stockholders' Equity |  |  |  |
Stock-based compensation expense |  | $ (0.1) |  |
Shares issued (in shares) | 0 |  |  |
Exercised (in shares) | 225,267 |  |  |
Cash paid to settle stock appreciation rights | $ 0.6 |  |  |
Canceled (in shares) | 29,815 |  |  |
Outstanding (in shares) | 178,500 | 178,500 |  |
Stock Option - Service Based |  |  |  |
Stockholders' Equity |  |  |  |
Shares and options vesting period |  | 4 years |  |
Dividend yield (as a percent) |  | 0.00% |  |
Expected volatility, minimum (as a percent) |  | 46.50% |  |
Expected volatility, maximum (as a percent) |  | 51.00% |  |
Risk free interest rate, minimum (as a percent) |  | 0.50% |  |
Risk free interest rate, maximum (as a percent) |  | 1.50% |  |
Stock Option - Service Based | Minimum |  |  |  |
Stockholders' Equity |  |  |  |
Expected term |  | 4 years 7 months 6 days |  |
Stock Option - Service Based | Maximum |  |  |  |
Stockholders' Equity |  |  |  |
Expected term |  | 7 years 4 months 24 days |  |
Restricted Stock - Service Based |  |  |  |
Stockholders' Equity |  |  |  |
Shares and options vesting period |  | 4 years |  |
Stock Option - Market-Based |  |  |  |
Stockholders' Equity |  |  |  |
Shares and options vesting period |  | 4 years |  |
Dividend yield (as a percent) |  | 0.00% |  |
Expected volatility, minimum (as a percent) |  | 46.70% |  |
Expected volatility, maximum (as a percent) |  | 51.20% |  |
Risk free interest rate, minimum (as a percent) |  | 1.50% |  |
Risk free interest rate, maximum (as a percent) |  | 1.70% |  |
Stock Option - Market-Based | Minimum |  |  |  |
Stockholders' Equity |  |  |  |
Expected holding period (as a percent) |  | 30.70% |  |
Stock Option - Market-Based | Maximum |  |  |  |
Stockholders' Equity |  |  |  |
Expected holding period (as a percent) |  | 100.00% |  |
Restricted Stock - Market Based |  |  |  |
Stockholders' Equity |  |  |  |
Shares and options vesting period |  | 4 years |  |
Dividend yield (as a percent) |  | 0.00% |  |
Expected volatility, minimum (as a percent) |  | 46.70% |  |
Expected volatility, maximum (as a percent) |  | 51.20% |  |
Risk free interest rate, minimum (as a percent) |  | 1.50% |  |
Risk free interest rate, maximum (as a percent) |  | 1.70% |  |
Restricted Stock - Market Based | Minimum |  |  |  |
Stockholders' Equity |  |  |  |
Expected holding period (as a percent) |  | 30.70% |  |
Restricted Stock - Market Based | Maximum |  |  |  |
Stockholders' Equity |  |  |  |
Expected holding period (as a percent) |  | 100.00% |  |

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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