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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability
The following table summarizes changes in the Company’s contract assets and liabilities for the six months ended June 30, 2018:
 
Balance at January 1, 2018
 
Additions
 
Deductions
 
Balance at June 30, 2018
Contract assets
 
 
 
 
 
 
 
Accounts receivable from MedImmune
$
1,693,530

 
$
2,541,901

 
$
(3,142,901
)
 
$
1,092,530

Contract liabilities
 
 
 
 
 
 
 
Deferred revenue - MedImmune
1,145,500

 
582,500

 
(882,000
)
 
846,000

Deferred revenue - ApolloBio
—

 
23,000,000

 
(23,000,000
)
 
—

Deferred revenue - Other
$
271,894

 
$
—

 
$
(125,251
)
 
$
146,643