Equity Transactions and Share-based Compensation - Narrative (Details) - USD ($)		1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2023	Aug. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Nov. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022	Feb. 29, 2024
Share-based Compensation Arrangement by Share-based Payment Award
Shares issued for restricted stock units (in shares)						6,000	187,000	287,000	408,000
One-time employee termination benefits									$ 600,000	$ 400,000
Share-based payment arrangement, expense						$ 2,389,000	$ 7,880,000	$ 7,331,000	15,204,000
Options granted (in shares)		150,000	120,000	223,000	950,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period								10 years
Vesting period								4 years
Independent Members Of Board
Share-based Compensation Arrangement by Share-based Payment Award
Share-based payment arrangement, expense									$ 300,000
The 2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares reserved for future issuance (in shares)						10,200,000		10,200,000
Shares issued pursuant to the exercise of stock options (in shares)						0	0	2,000	0
The 2013 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares reserved for future issuance (in shares)						1,500,000		1,500,000
Number of shares authorized to be granted (in shares)						4,800,000		4,800,000
Additional shares authorized (in shares)	422,535
Participation term (in months)								24 months
Percentage of pay that employee can contribute, maximum (as a percent)						15.00%		15.00%
Discounted purchase price from market price, offering date (as a percent)								15.00%
Discounted purchase price from market price, purchase date (as a percent)								15.00%
Purchase interval (in months)								6 months
Shares issued pursuant to employee stock purchase plan (in shares)						297,000	121,000	717,000	429,000
Public Offering
Share-based Compensation Arrangement by Share-based Payment Award
Sale of common stock, amount authorized											$ 250,000,000
Public Offering | Jeffries LLC
Share-based Compensation Arrangement by Share-based Payment Award
Sale of common stock, amount authorized											$ 75,000,000