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Revenue Recognition - Summary of balances and activities in our contract asset account (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
Reclassification (1) $ 71,307 [1]
Balance at End of Period 71,307
CpG 1018 adjuvant  
Balance at Beginning of Period 71,965 [2]
Additions 3,398 [2]
Subtractions (2,554) [2]
Reclassification (1) (71,307) [1],[2]
Balance at End of Period $ 1,502 [2]
[1] (1) The Clover contract asset was reclassified to long term assets to reflect the timing of expected long term demand for CpG 1018 adjuvant for Clover Product. See Note 6 for further discussion
[2]

(2) The $1.5 million of contract asset is derived from our agreement with the DoD.