Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended		12 Months Ended
	Aug. 24, 2022 USD ($) $ / shares D shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 shares	Dec. 31, 2021 $ / shares shares	Apr. 04, 2017 shares
Class of Warrant or Right [Line Items]
Minimum percentage of warrants vested and exercisable automatically			60.00%
Par value, common stock | $ / shares		$ 0.01	$ 0.01		$ 0.01
Warrants issued with the Amazon, Inc transaction agreement
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)						55,286,696
Number of warrants exercised (in shares)			17,461,994	17,461,994
Warrant shares vested (in shares)					55,286,696
Warrants issued with the Amazon, Inc transaction agreement | Amazon
Class of Warrant or Right [Line Items]
Number of warrants exercised (in shares)			17,461,994		17,461,994
Warrant Issued With Amazon
Class of Warrant or Right [Line Items]
Cash payments to be received under agreement | $	$ 2,100.0
Warrant percentage weighted average share price	90.00%
Warrant Issued With Amazon | Vesting of First Warrants Shares
Class of Warrant or Right [Line Items]
Number of warrants exercisable	9,000,000
Warrant shares vested (in shares)	9,000,000
Exercise price of warrants (in dollars per share) | $ / shares	$ 22.9841
Fair value of warrants per share | $ / shares	$ 20.36
Warrant Issued With Amazon | Vesting of Remaining Warrants Shares
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	7,000,000
Warrant Issued With Amazon | Vest in multiple tranches
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)	15,000,000
Vesting period	7 years
Warrant shares vested (in shares)	15,000,000
2022 Amazon transaction agreement
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)	16,000,000
Reduction in revenue | $		$ 1.8	$ 1.8
Warrant shares vested (in shares)		1,000,000	1,000,000
Class Of Warrant Or Right Exercisable on Vesting Threshold Trading Days | D	30
Warrant charge capitalized | $		$ 20.4	$ 20.4
2022 Amazon transaction agreement | Vest immediately upon issuance
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	1,000,000
2022 Amazon transaction agreement | Tranches 1-3 | Risk free interest rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input	0.0315
2022 Amazon transaction agreement | Tranches 1-3 | Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input	0.7500
2022 Amazon transaction agreement | Tranches 1-3 | Expected average term
Class of Warrant or Right [Line Items]
Expected average term	7 years
2022 Amazon transaction agreement | Tranches 1-3 | Exercise price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares	22.98
2022 Amazon transaction agreement | Tranches 1-3 | Stock price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares	20.36
2022 Amazon transaction agreement | Tranche 4 | Risk free interest rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input		0.0390	0.0390
2022 Amazon transaction agreement | Tranche 4 | Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input		0.7500	0.7500
2022 Amazon transaction agreement | Tranche 4 | Expected average term
Class of Warrant or Right [Line Items]
Expected average term			4 years
2022 Amazon transaction agreement | Tranche 4 | Exercise price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares		18.91	18.91
2022 Amazon transaction agreement | Tranche 4 | Stock price
Class of Warrant or Right [Line Items]
Warrants and rights outstanding measurement input | $ / shares		12.71	12.71