Warrant Transaction Agreements - Amazon.com, Inc. Transaction Agreement (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Aug. 24, 2022 USD ($) D $ / shares shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Jun. 30, 2023 shares	Aug. 31, 2022 shares	Apr. 30, 2017 shares	Apr. 04, 2017 shares
2017 Amazon 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	55,286,696
Warrant shares vested (in shares)		55,286,696	55,286,696
2017 Amazon Transaction Agreement | Amazon
Class of Warrant or Right [Line Items]
Number of warrants exercised (in shares)		34,917,912	34,917,912
Provision for common stock warrants | $		$ 0.4	$ 0.4	$ 0.4
2022 Amazon transaction agreement
Class of Warrant or Right [Line Items]
Minimum percentage of warrants vested and exercisable automatically	60.00%
Shares of common stock that can be purchased from warrants issued (in shares)	16,000,000					16,000,000
Number of warrants exercised (in shares)		0	0
Warrant shares vested (in shares)		3,000,000	2,000,000
Provision for common stock warrants | $		$ 19.0	$ 4.9	$ 5.2
2022 Amazon transaction agreement | Maximum
Class of Warrant or Right [Line Items]
Shares of common stock that can be purchased from warrants issued (in shares)	16,000,000
2022 Amazon transaction agreement | Warrants Tranches One Through Three
Class of Warrant or Right [Line Items]
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
2022 Amazon transaction agreement | Tranche one
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	1,000,000
Warrant charge capitalized | $	$ 20.4
Contract asset | $		16.5
2022 Amazon transaction agreement | Tranche two
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)					1,000,000
Warrant charge capitalized | $	20.4
Contract asset | $		16.5
2022 Amazon transaction agreement | Tranche three
Class of Warrant or Right [Line Items]
Cash payments to be received under agreement | $	$ 1,000.0
Contract asset | $		$ 0.2
2022 Amazon transaction agreement | Tranche four
Class of Warrant or Right [Line Items]
Warrant shares vested (in shares)	7,000,000
Warrant percentage weighted average share price	90.00%
Threshold trading days | D	30
2022 Amazon transaction agreement | Share-Based Payment Arrangement, Tranche Two
Class of Warrant or Right [Line Items]
Vesting period	7 years
Cash payments to be received under agreement | $	$ 2,100.0
Warrant shares vested (in shares)	15,000,000