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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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