Quarterly report pursuant to Section 13 or 15(d)

Revenue and Accounts Receivable - Additional Information (Details)

v3.8.0.1
Revenue and Accounts Receivable - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
company
Mar. 31, 2017
USD ($)
company
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue $ 7,667 $ 6,966
Payor | Testing Volume | Clinical Testing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of benchmark 17.00% 35.00%
Payor | Sales | 10% or More Clinical Revenue    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of benchmark 10.00%  
Number of companies that accounted for approximately 10% or more of revenue | company 0 1
Payor | Sales | Customer One | 10% or More Clinical Revenue    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of benchmark   11.00%
VivoPharm    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue $ 1,428  
Clinical Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue $ 2,342 $ 2,954
Revenue, payment terms 6 months