Quarterly report pursuant to Section 13 or 15(d)

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

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Revenue and Accounts Receivable - Schedule of Accounts Receivable by Service Type (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (1,366) $ (1,387)
Accounts receivable, net 12,675 11,748
Biopharma Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 3,315 3,683
Clinical Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 10,310 8,972
Discovery Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current $ 416 $ 480