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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Feb. 29, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]            
Prepaid assets $ 16,645,000   $ 16,645,000     $ 34,743,000 [1]
Accounts payable - related parties 2,860,000   2,860,000     3,548,000 [1]
Research and development expense 64,573,000 $ 68,218,000 195,430,000 $ 161,629,000    
General and administrative expenses from transactions with related party 30,000 168,000 80,000 511,000    
Medpace Inc            
Related Party Transaction [Line Items]            
Accounts payable - related parties 2,900,000   2,900,000     3,500,000
Research and development expense 7,900,000 10,000,000 31,900,000 33,700,000    
Medpace Inc | Clinical Material Manufacturing And Other Related Parties            
Related Party Transaction [Line Items]            
Prepaid assets 5,800,000   5,800,000     10,900,000
Medpace Inc | Accrued Clinical, Manufacturing and Other - Related Parties            
Related Party Transaction [Line Items]            
Accrued and other liabilities 6,000,000   6,000,000     6,100,000
Board of Directors | Recruiting Services            
Related Party Transaction [Line Items]            
Research and development expense 0 0 131,000 258,000    
Related party balances 0   0     $ 0
General and administrative expenses from transactions with related party $ 30,000 $ 168,000 $ 80,000 $ 511,000    
Affiliated Entity            
Related Party Transaction [Line Items]            
Aggregate principal amount         $ 25,000,000  
[1] The consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated balance sheet included in the Company’s 2015 Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 29, 2016.