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NIH Contract (Tables)
3 Months Ended
Mar. 31, 2022
Research and Development [Abstract]  
Summary of Research and Development Activity Under NIH Contract
The following table summarizes the activity under the NIH Contract as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Cash receipts from milestones achieved$34,016 $34,016 
Cumulative amounts applied against operating costs (excluding depreciation)(4,526)(4,522)
Cumulative amounts applied against depreciation expense for assets placed in service(1,510)(703)
Cumulative amounts recognized as non-operating income(7,140)(7,140)
Total deferred grant income$20,840 $21,651 
Assets placed in service, gross$20,425 $16,890 
Construction-in-progress937 3,909 
Cumulative amounts applied against depreciation expense(1,510)(703)
Carrying value of property and equipment, net19,85220,096
Estimated future capital expenditures988 1,555 
Total deferred grant income$20,840 $21,651 
Deferred grant income, current$3,603 $3,535 
Deferred grant income, non-current17,237 18,116 
Total deferred grant income$20,840 $21,651