Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	May 31, 2022	Sep. 30, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, net of amounts capitalized					$ 1,533	$ 2,620	$ 5,863	$ 8,893
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							405,648
Unrecognized compensation cost, period for recognition (in years)							2 years 1 month 24 days
Unrecognized compensation costs					6,800		$ 6,800
RSUs | New Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)							4 years
Award cliff vesting period (in years)							1 year
RSUs | Existing Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)							3 years
PSUs With Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	50,000						77,409
Total grant date fair value	$ 300
PSUs With Market Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value			$ 4,000
Number of shares granted (in shares)			40,000
PSUs With Market Conditions | Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of equity instruments vested during the period			$ 1,300
PSUs With Market Conditions | Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of equity instruments vested during the period			1,400
PSUs With Market Conditions | Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of equity instruments vested during the period			$ 1,400
PSUs With Market Conditions | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value		$ 100
Number of shares granted (in shares)		30,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, net of amounts capitalized					0	$ 200	$ 200	$ 600
Unrecognized compensation cost, period for recognition (in years)							1 year 5 months 4 days
Unrecognized compensation costs					0		$ 0
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested share-based compensation arrangements granted					$ 1,400		$ 1,400
Unrecognized compensation cost, period for recognition (in years)							1 year 5 months 23 days
2021 Equity Incentive Plan:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period for increase in shares (in years)				10 years
Percent of outstanding shares				4.00%
2021 Equity Incentive Plan: | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, maximum number of shares available for issue on the exercise of incentive stock options (in shares)				100,000,000
2021 Employee Stock Purchase Plan: | 2021 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, period for increase in shares (in years)				10 years
Percent of outstanding shares				1.00%
Stock-based compensation, number of additional shares allowable under the plan (in shares)				142,500
Stock-based compensation, purchase period (in months)				6 months
2021 Employee Stock Purchase Plan: | Class A Common Stock | 2021 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, discount percentage from market price, beginning of period				85.00%