Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2019	Sep. 17, 2025	Nov. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share repurchase program, authorized amount		$ 100.0		$ 100.0			$ 100.0
Stock repurchased (in shares)		2,560,030		2,560,030
Share repurchase program, average price (in dollars per share)		$ 7.91		$ 7.91
Share repurchase program, acquired, value net of commissions		$ 20.2		$ 20.2
Share repurchase program, commissions and excise tax		0.1		0.1
Share repurchase program, remaining authorized amount		79.8		79.8
Decrease in compensation expense		3.6		5.3
Compensation expense		10.1	$ 24.7	35.5	$ 64.9
Compensation expense not yet recognized		$ 41.7		$ 41.7
Inducement grants (in shares)				255,611
Weighted-average grant date fair value of options (in dollars per share)				$ 12.46	$ 27.69
Intrinsic value of options exercised				$ 0.0	$ 3.6
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	311,850
Common stock reserved for issuance represented as percentage on outstanding common stock	1.00%
Common stock, shares remained available for purchase (in shares)		3,601,429		3,601,429
Common stock, shares issued (in shares)				86,008	85,119
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of inducement grants (in shares)				170,365
Granted (in dollars per share)				$ 13.93	$ 44.69
Total intrinsic value of RSUs released				$ 16.9	$ 12.7
Total fair value of RSUs vested				$ 43.3	12.3
Weighted Average
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense not yet recognized, period of recognition (in years)				1 year 6 months
2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	4,067,007
Common stock, shares remained available for purchase (in shares)		2,797,459		2,797,459
Annual increase in reserved shares as percentage of outstanding common stock						4.00%
2018 Plan | ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense		$ 0.1	$ 0.1	$ 0.4	$ 0.6
2018 Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in dollars per share)				$ 13.93
2018 Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	1,277,181
2018 Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual increase in reserved shares of common stock (in shares)						4,989,593
Piper Sandler and Cantor | At-the-Market Offering | Equity Distribution Agreement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock aggregate offering price								$ 262.8
Common stock issued, net of issuance costs (in shares)				0