Stock-Based Compensation and Equity Grants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023
Number of Shares
Options outstanding, beginning (in shares)	2,278
Granted (in shares)	0
Exercised (in shares)	(220)
Cancelled (in shares)	(25)
Options outstanding, ending (in shares)	2,033	2,278
Weighted Average Exercise Price
Options outstanding, beginning (in dollars per share)	$ 8.40
Granted (in dollars per share)	0
Exercised (in dollars per share)	2.29
Cancelled (in dollars per share)	11.66
Options outstanding, ending (in dollars per share)	$ 9.02	$ 8.40
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	6 years	5 years 9 months 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 13,803	$ 8,693
Vested and exercisable (in shares)	1,423
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 7.18
Vested and exercisable, weighted average remaining contractual term (in years)	4 years 9 months 18 days
Vested and exercisable, intrinsic value	$ 12,208