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Collaboration Agreements (Tables)
 12 Months Ended
Dec. 31, 2021
Collaboration agreements  
Schedule of changes in the balances of our contract assets and liabilities and recognized revenue
The following table presents changes in the balances of our contract assets and liabilities during the years ended December 31, 2021 and December 31, 2020:
Balance at
Beginning
of Period
Additions
Deductions
Balance at
End of Period
Year ended December 31, 2021
Contract assets
$— $— $— $— 
Contract liabilities:
Deferred revenue
$3,987 $— $43 $3,944 
Balance at
Beginning
of Period
Additions
Deductions
Balance at
End of Period
Year ended December 31, 2020
Contract assets
$— $— $— $— 
Contract liabilities:
Deferred revenue
$4,815 $— $828 $3,987 
During the year ended December 31, 2021, the Company recognized the following revenues as a result of changes in the contract asset and the contract liability balances in the respective periods.
Year ended December 31,
20212020
Revenue recognized in the period from:
Amounts included in the contract liability at the beginning of the period$43 $828 
Performance obligations satisfied in previous periods$— $—