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Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Contract asset, current	$ 8,793	$ 14,401
VUMERITY | Biogen | Other Assets
Disaggregation Of Revenue [Line Items]
Contract asset, non-current	$ 5,000
Minimum
Disaggregation Of Revenue [Line Items]
Manufacturing Process period	10 days
Maximum
Disaggregation Of Revenue [Line Items]
Manufacturing Process period	56 days
Consideration expects to receive	2 years

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent.

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