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Equity Method Investments - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
CNY (¥)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
CNY (¥)
Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]              
Ownership interest to be made in joint venture   30.00%   30.00%   30.00% 30.00%
Royalty earned | $   $ 8,424,000 $ 5,400,000 $ 13,794,000 $ 10,053,000    
Royalty | License Agreement              
Schedule Of Equity Method Investments [Line Items]              
Royalty earned | $     $ 17,000   $ 35,000    
FF Gene Biotech              
Schedule Of Equity Method Investments [Line Items]              
Contribution to be made in joint venture | ¥ ¥ 60,000,000            
Contribution period in joint venture 5 years            
Previous contribution period in joint venture 3 years            
Ownership interest to be made in joint venture 30.00% 30.00%   30.00%   30.00% 30.00%
Contributions remain for joint venture   $ 5,900,000   $ 5,900,000   ¥ 40,300,000  
FF Gene Biotech | Equipment              
Schedule Of Equity Method Investments [Line Items]              
Contributions made to joint venture | $       $ 3,000,000      
Xilong Scientific | FF Gene Biotech              
Schedule Of Equity Method Investments [Line Items]              
Contribution to be made in joint venture | ¥ ¥ 102,000,000            
Contribution period in joint venture 5 years            
Previous contribution period in joint venture 3 years            
Ownership interest to be made in joint venture 51.00%            
FJIP | FF Gene Biotech              
Schedule Of Equity Method Investments [Line Items]              
Contribution to be made in joint venture | ¥ ¥ 19,000,000            
Contribution period in joint venture 10 years            
Previous contribution period in joint venture 5 years            
Ownership interest to be made in joint venture 19.00%