Debt - Narrative (Details)				1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 25, 2020 USD ($)	Apr. 30, 2020 USD ($) $ / shares	Apr. 23, 2020	Apr. 30, 2020 USD ($) day $ / shares	Jun. 30, 2022 USD ($) agreement	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) agreement	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Nov. 04, 2021 USD ($)	Jun. 29, 2021 USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment					$ 0	$ (1,101,000)	$ 0	$ (1,101,000)
Proceeds from debt							385,000	469,595,000
Standby Letters of Credit
Debt Instrument [Line Items]
Borrowing capacity terminated					$ 16,200,000		$ 16,200,000
Prince Georges County Maryland
Debt Instrument [Line Items]
Interest rate (as a percent)					3.00%		3.00%
Number of contracts (in contracts) | agreement					2		2
Convertible senior notes
Debt Instrument [Line Items]
Net carrying amount					$ 380,000,000		$ 380,000,000		$ 380,000,000
Deferred government grant obligations
Debt Instrument [Line Items]
Net carrying amount					3,500,000		3,500,000		3,500,000
Interest payable					600,000		600,000		500,000
Deferred government grant obligations | Prince Georges County Maryland
Debt Instrument [Line Items]
Net carrying amount					$ 3,500,000		$ 3,500,000
Term Loan Agreement | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount										$ 100,000,000	$ 475,000,000
Principal repayments (as a percent)										0.25%	0.25%
Debt instrument, effective interest rate percentage					8.00%		8.00%
Interest expense					$ 11,100,000		$ 22,200,000
Term Loan Agreement | Line of Credit | Base rate
Debt Instrument [Line Items]
Interest rate (as a percent)											4.75%
Term Loan Agreement | Line of Credit | Eurodollar
Debt Instrument [Line Items]
Interest rate (as a percent)											5.75%
Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity terminated	$ 50,000,000
Debt instrument, principal amount of the lenders' commitments	100,000,000
Loss on debt extinguishment	$ 1,100,000
Credit Agreement | Letter of Credit | Base rate
Debt Instrument [Line Items]
Variable rate, applicable margin (as a percent)	2.75%
Credit Agreement | Letter of Credit | LIBOR
Debt Instrument [Line Items]
Variable rate, applicable margin (as a percent)	3.75%
Credit Agreement | Letter of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Variable rate, applicable margin (as a percent)	0.00%
The Notes | Convertible senior notes
Debt Instrument [Line Items]
Interest rate (as a percent)		2.25%		2.25%	2.25%		2.25%
Aggregate principal amount		$ 380,000,000		$ 380,000,000	$ 380,000,000		$ 380,000,000		380,000,000
Proceeds from debt				$ 369,600,000
Debt instrument, interest rate, effective percentage					2.90%		2.90%
Debt issuance costs					$ 2,700,000	$ 7,600,000	$ 5,300,000	$ 15,200,000
Debt instrument, convertible, threshold percentage of stock price trigger				130.00%
Debt instrument, convertible, threshold trading days | day				20
Debt instrument, convertible, threshold consecutive trading days | day				30
Debt instrument, convertible, threshold consecutive trading days, sale price per share | day				5
Debt instrument, convertible, measurement period | day				10
Debt instrument, threshold percentage of sales price per share				98.00%
Debt instrument, convertible, conversion ratio			0.0353773
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares		$ 28.27		$ 28.27
Capped call, cap price (in dollars per share) | $ / shares		$ 44.34
Purchases of capped calls in connection with convertible senior notes		$ 50,500,000
Net carrying amount					374,060,000		374,060,000		291,287,000
Senior Secured Term Loan Facility | Line of Credit
Debt Instrument [Line Items]
Senior secured term loan facility				$ 250,000,000
Fair Value, Inputs, Level 2 | Convertible senior notes
Debt Instrument [Line Items]
Fair value					$ 322,700,000		$ 322,700,000		$ 403,300,000