Quarterly report pursuant to Section 13 or 15(d)

Revenue and Accounts Receivable - Schedule of Clinical Services Revenue (Details)

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Revenue and Accounts Receivable - Schedule of Clinical Services Revenue (Details) - Payor - Revenue
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Product Information [Line Items]        
Percentage of revenue 26.00% 36.00% 29.00% 41.00%
Medicare        
Product Information [Line Items]        
Percentage of revenue 8.00% 11.00% 10.00% 14.00%
Other third party payors        
Product Information [Line Items]        
Percentage of revenue 18.00% 25.00% 19.00% 27.00%