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Summary of Significant Accounting Policies (Details)
 6 Months Ended 12 Months Ended
Oct. 25, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 01, 2017
USD ($)
Property, Plant and Equipment [Line Items]            
Number of operating segments | segment     1      
Fixed asset impairment   $ 2,200,000 $ 400,000 $ 2,000,000 $ 0  
Furniture            
Property, Plant and Equipment [Line Items]            
Estimated useful life of the asset     5 years      
Computer equipment            
Property, Plant and Equipment [Line Items]            
Estimated useful life of the asset     3 years      
Retained Earnings | Accounting Standards Update 2016-09            
Property, Plant and Equipment [Line Items]            
Cumulative effect of new accounting principle in period of adoption           $ 300,000
IVF Japan            
Property, Plant and Equipment [Line Items]            
Fixed fee revenue per treatment cycle $ 1,000          
Reimbursed amount of lab operations and personnel costs $ 200,000   $ 55,000      
Minimum            
Property, Plant and Equipment [Line Items]            
Short-term investments, maturity term     1 year      
Minimum | Laboratory equipment            
Property, Plant and Equipment [Line Items]            
Estimated useful life of the asset     3 years      
Maximum            
Property, Plant and Equipment [Line Items]            
Short-term investments, maturity term     2 years      
Maximum | Laboratory equipment            
Property, Plant and Equipment [Line Items]            
Estimated useful life of the asset     5 years