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Debt - Convertible Notes (Details)		1 Months Ended	3 Months Ended	6 Months Ended
Debt - Convertible Notes (Details)	Sep. 04, 2019 $ / shares	Sep. 30, 2019 USD ($) $ / shares $ / unit	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($) d	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio	0.04004
Debt instrument trading days \| d				20
Debt instrument consecutive trading day \| d				30
Payment for capped call share options		$ 32,900,000
Call Option
Debt Instrument [Line Items]
Capped price (in dollars per share) \| $ / unit		37.00
Premium of cap price as a percentage of closing price		100.00%
COMMON STOCK
Debt Instrument [Line Items]
Closing stock price (in dollars per share) \| $ / shares	$ 18.50	$ 18.50
Convertible notes
Debt Instrument [Line Items]
Principal amount		$ 316,250,000
Interest rate		1.50%
Convertible notes \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount				$ 316,250,000	$ 316,250,000
Debt instrument, convertible conversion price (in dollars per share) \| $ / shares	$ 24.98
Stock price trigger, premium on closing price (as a percent)	35.00%
Redemption price (as a percent)				100.00%
Stock price trigger (as a percent)				130.00%
Equity component of convertible debt				$ 128,400,000
Debt issuance costs incurred			$ 9,200,000
Debt issuance costs, net			$ 5,500,000	3,838,000	$ 4,312,000
Debt issuance costs related with equity component of convertible debt				3,700,000
Convertible notes \| Convertible Senior Notes Due 2024 \| LEVEL 3
Debt Instrument [Line Items]
Convertible notes fair value of liability component				$ 187,900,000
Convertible notes fair value of liability component, effective interest rate percentage				10.50%