Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Sep. 29, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Oct. 19, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		2,250,000,000
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)		25,000,000
Preferred stock, par value (in USD per share)		$ 0.0001
Preferred stock, shares issued (in shares)		0
Preferred stock, shares outstanding (in shares)		0
Warrants outstanding (in shares)	24,876,512	5,973,870			15,277,974
Stockholders' equity		$ 327,634	$ 365,693	$ 391,677	$ 340,823		$ 285,502	$ 63,175	$ 52,880	$ 76,246
Prior Year Adjustment of Warrants
Class of Stock [Line Items]
Stockholders' equity					0
Accumulated Deficit
Class of Stock [Line Items]
Stockholders' equity		(488,863)	(434,151)	(354,914)	(315,682)		(204,224)	(197,128)	(187,401)	(164,016)
Accumulated Deficit | Prior Year Adjustment of Warrants
Class of Stock [Line Items]
Stockholders' equity					1,585
Additional Paid in Capital
Class of Stock [Line Items]
Stockholders' equity		$ 816,710	$ 800,040	$ 746,824	656,717		$ 489,920	$ 260,539	$ 240,485	$ 240,464
Additional Paid in Capital | Prior Year Adjustment of Warrants
Class of Stock [Line Items]
Stockholders' equity					$ (1,585)
Public Warrants
Class of Stock [Line Items]
Number of shares available per warrant (in shares)	0.75
Warrant exercise price (in USD per share)	$ 11.50					$ 11.50
Period after the Business Combination after which the public warrants become exercisable	30 days
Warrant expiration period	5 years
Redemption price (in dollars per share)		$ 0.01
Stock price trigger (in USD per share)	$ 18.00
Threshold trading days	20 days
Threshold trading day window	30 days
Days prior to notice of redemption	3 days
Shares registered that may be issued upon exercise of warrants (in shares)						18,657,384
Working Capital Warrants
Class of Stock [Line Items]
Warrant exercise price (in USD per share)						$ 11.50
Shares registered that may be issued upon exercise of warrants (in shares)						375,000