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Revenue Recognition (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018:
 
Balance at January 1, 2018
 
Additions
 
Deductions
 
Balance at September 30, 2018
Contract assets
 
 
 
 
 
 
 
Accounts receivable from MedImmune
$
1,693,530

 
$
3,865,641

 
$
(3,206,848
)
 
$
2,352,323

Contract liabilities
 
 
 
 
 
 
 
Deferred revenue - MedImmune
1,145,500

 
732,200

 
(1,582,167
)
 
295,533

Deferred revenue - ApolloBio
—

 
23,000,000

 
(23,000,000
)
 
—

Deferred revenue - Other
$
271,894

 
$
93,750

 
$
(208,291
)
 
$
157,353