Annual report pursuant to Section 13 and 15(d)

Revenue and Accounts Receivable - Schedule of Accounts Receivable by Service Type (Detail)

v3.8.0.1
Revenue and Accounts Receivable - Schedule of Accounts Receivable by Service Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (6,539) $ (1,387)
Accounts receivable, net 10,958 11,748
Biopharma Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 3,746 3,683
Clinical Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 12,205 8,972
Discovery Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 1,546 $ 480