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Impact of Recently Issued Accounting Standards - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
lease
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Contra-research and development expense $ 1,900,000 $ 4,100,000  
Number of operating leases | lease   3  
Accounting Standards Update 2016-01 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect     $ (231,366)
Accounting Standards Update 2016-01 | AOCI Attributable to Parent      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect     $ (231,366)
Plumbline Life Sciences      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Gain (loss) on investment in affiliated entities $ (639,000) $ 343,000