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Goodwill and Intangible Assets - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
ReportingUnit
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Goodwill And Intangible Assets [Line Items]      
Number of reporting units | ReportingUnit 2    
Description of annual goodwill impairment test The Company tested its goodwill for impairments as of December 1, 2016. The Company performed step one of its annual Goodwill impairment test    
Goodwill impairment $ 13,021,000 $ 0 $ 0
Amortization expense of intangible assets 1,700,000 $ 0  
Acquired in-process research and development 6,700,000    
Cost of Product [Member]      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 1,000,000    
Sales and marketing [Member]      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 700,000    
Olerup [Member]      
Goodwill And Intangible Assets [Line Items]      
Description of goodwill impairment method for fair value determination determined that the fair value of the Olerup reporting unit was $1.7 million, which was lower than its carrying value.    
Reporting unit, amount of fair value in excess of carrying value $ 1,700,000    
Goodwill impairment $ 13,000,000    
Reporting unit, percentage of fair value 10.00%    
Reporting unit, discount rate 16.80%    
Reporting unit, terminal growth rate 3.20%    
Reporting unit, capitalization multiple $ 7.37    
Olerup [Member] | Maximum [Member]      
Goodwill And Intangible Assets [Line Items]      
Goodwill impairment $ 630,000    
CareDx [Member] | Maximum [Member]      
Goodwill And Intangible Assets [Line Items]      
Reporting unit, percentage of fair value 75.00%