Leases - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Total plant space (in square feet) | ft²	534,894		534,894
Rent expense	$ 4,400	$ 2,800	$ 11,400	$ 6,800
Financing obligations, non-current	$ 456,315		$ 456,315		$ 459,981
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	15 years		15 years