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Investments in Joint Ventures - Intrexon Energy Partners II - Additional Information (Details)
1 Months Ended
Dec. 31, 2015
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
board_seat
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]        
Investment   $ 17,627,000 $ 18,859,000  
Intrexon Energy Partners II, LLC        
Schedule of Equity Method Investments [Line Items]        
Membership interest       50.00%
Maximum additional capital contribution committed       $ 10,000,000
Total number of seats on the joint venture's governing board | board_seat     5  
Total number of seats on the joint venture's governing board, internally selected | board_seat     1  
Total number of seats on the joint venture's governing board, externally selected | board_seat     4  
Intrexon Energy Partners II, LLC | Other Accrued Liabilities        
Schedule of Equity Method Investments [Line Items]        
Investment   $ (265,000) $ (50,000)  
Intrexon Energy Partners II, LLC | Investors        
Schedule of Equity Method Investments [Line Items]        
Membership interest       50.00%
Capital contributions $ 18,000,000      
Maximum additional capital contribution committed       $ 10,000,000
Intrexon Energy Partners II, LLC | All Investors        
Schedule of Equity Method Investments [Line Items]        
Capital contributions 4,000,000      
Intrexon Energy Partners II, LLC | Collaboration and licensing agreements        
Schedule of Equity Method Investments [Line Items]        
Collaborative arrangement consideration received, value $ 18,000,000