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Revenue Recognition - Summary of balances and activities in our contract asset account (Details) - CpG 1018 adjuvant
$ in Thousands
 9 Months Ended
Sep. 30, 2022
USD ($)
Balance at Beginning of Period $ 62,525
Additions (1) 38,410 [1]
Subtractions (2) (28,181) [2]
Balance at End of Period $ 72,754
[1]

(1) Additions are, primarily, revenues recognized for CpG 1018 adjuvant transferred to Clover that is reserved under the CEPI Agreement, as amended.
[2]

(2) Subtractions are reclassifications from contract asset to accounts receivables.