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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2018:
 
Balance at January 1, 2018
 
Additions
 
Deductions
 
Balance at March 31, 2018
Contract assets
 
 
 
 
 
 
 
Accounts receivable from MedImmune
$
1,693,530

 
$
1,339,961

 
$
(3,750
)
 
$
3,029,741

Contract liabilities
 
 
 
 
 
 
 
Deferred revenue - MedImmune
1,145,500

 
582,500

 
(531,583
)
 
1,196,417

Deferred revenue - ApolloBio
—

 
23,000,000

 
—

 
23,000,000

Deferred revenue - Other
$
271,894

 
$
—

 
$
(120,534
)
 
$
151,360
Summary of Revenue Recognized from Contracts