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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property & Equipment and Patent Costs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Property and equipment      
Depreciation expense $ 11,300 $ 7,600 $ 3,700
Assets under construction 6,711 8,038  
Impairment of long-lived assets $ 0 0 $ 0
Software Capitalization Policy      
Software development stages | item 3    
Patent Costs and Intangible Assets      
Accrued liabilities $ 28,106 22,253  
Amortization of intangible assets $ 200 $ 150  
MDx Health | Licensed Intellectual Property      
Patent Costs and Intangible Assets      
Estimated useful life 10 years    
Intangible asset, net $ 1,600    
Accrued liabilities 1,300    
Amortization of intangible assets $ 200    
Laboratory equipment | Minimum      
Property and equipment      
Estimated Useful Life 3 years    
Laboratory equipment | Maximum      
Property and equipment      
Estimated Useful Life 5 years    
Furniture and fixtures      
Property and equipment      
Estimated Useful Life 3 years    
Computer equipment and computer software      
Property and equipment      
Estimated Useful Life 3 years    
Buildings      
Property and equipment      
Estimated Useful Life 30 years    
Building and leasehold improvements      
Property and equipment      
Assets under construction $ 100    
Software projects      
Property and equipment      
Assets under construction 1,700    
Machinery and equipment      
Property and equipment      
Assets under construction $ 4,900