Summary of Significant Accounting Policies - Liquidity and Going Concern Evaluation (Details) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended						9 Months Ended
	Oct. 06, 2022	Sep. 07, 2022	Aug. 07, 2022	May 05, 2022	Apr. 29, 2022	Feb. 14, 2022	May 05, 2021	Oct. 16, 2020	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Cash and cash equivalents									$ 30,977			$ 35,282			$ 30,977	$ 35,282		$ 82,160	$ 44,122
Long-term debt									27,400						27,400
Long-term debt									27,365						27,365			25,886
Less: current debt																		3,500
Minimum liquidity balance															25,000
Proceeds from issuance of common stock, gross proceeds													$ 21,144
Net losses									25,750	$ 23,123	$ 38,449	$ 27,636	$ 18,587	$ 15,721	87,322	61,944
Operating cash flows															(68,143)	$ (27,396)
Warrant exercise price (in dollars per share)							$ 0.01
Equity subject to warrant exercise (as a percent)							0.50%
Private Placement | Class A
Significant Accounting Policies [Line Items]
Share price					$ 12.00
April 2022 Private Placement | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold					3,333,333
February 2022 Private Placement | Private Placement
Significant Accounting Policies [Line Items]
Proceeds from issuance of common stock, net of offering costs						$ 5,000
February 2022 Private Placement | Private Placement | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold						357,143
Purchase agreement with RJB | Class A
Significant Accounting Policies [Line Items]
Equity commitment, shares		10,000,000
Purchase agreement with RJB | Private Placement
Significant Accounting Policies [Line Items]
Proceeds from issuance of common stock, gross proceeds					$ 20,000
Purchase agreement with RJB | Private Placement | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold			10,000,000
Proceeds from issuance of common stock, gross proceeds		$ 56,500
Share price		$ 5.65	$ 5.00
Equity commitment, shares			10,000,000
Purchase Agreement with RJB Partners LLC, April 2022 | Class A
Significant Accounting Policies [Line Items]
Proceeds from issuance of common stock, gross proceeds					$ 40,000
Purchase Agreement with RJB Partners LLC, April 2022 | Private Placement | Class A
Significant Accounting Policies [Line Items]
Share price			$ 12.00
Equity commitment, shares			1,666,667
Purchase Agreement with RJB Partners LLC, August 2022
Significant Accounting Policies [Line Items]
Equity commitment																	$ 50,000
Purchase Agreement with RJB Partners LLC, August 2022 | Private Placement | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold		10,000,000	8,333,333
Proceeds from issuance of common stock, gross proceeds			$ 50,000
Share price		$ 5.65	$ 5.00
Equity commitment									56,500						56,500
Gift Card Sponsorship Agreement with Aspiration Carbon Reduction
Significant Accounting Policies [Line Items]
Unredeemed gift cards sponsored		$ 18,500		$ 20,000											5,600
Note Purchase and Guarantee Agreement
Significant Accounting Policies [Line Items]
Minimum asset coverage ratio				1.25%
Any date subsequent to June 30, 2022 | Note Purchase and Guarantee Agreement
Significant Accounting Policies [Line Items]
Minimum liquidity balance				$ 15,000
Performed Asset Valuation | Note Purchase and Guarantee Agreement
Significant Accounting Policies [Line Items]
Minimum liquidity balance				$ 25,000
Scenario, Plan | Purchase agreement with RJB | Private Placement | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold					1,666,666
2020 Term Loan
Significant Accounting Policies [Line Items]
Long-term debt									27,365						27,365			29,386
Long-term debt									$ 27,365						$ 27,365			25,886
Less: current debt																		$ 3,500
Face value of debt								$ 35,000
Margin added to variable rate (as a percent)								1.50%
Interest rate (as a percent)								8.00%
Warrant exercise price (in dollars per share)							$ 0.01
Equity subject to warrant exercise (as a percent)							0.50%
2021 Term Loan
Significant Accounting Policies [Line Items]
Face value of debt							$ 5,000
Margin added to variable rate (as a percent)							1.50%
Interest rate (as a percent)							9.00%
Subsequent Event | Class A
Significant Accounting Policies [Line Items]
Shares issued and sold	4,622,772
Proceeds from issuance of common stock, net of offering costs	$ 14,100