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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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