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Goodwill and Intangible Assets - Summary of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Balance as of December 31, 2015 $ 12,005    
Goodwill acquired 16,922    
Goodwill impairment (13,021) $ 0 $ 0
Foreign currency translation adjustments (2,067)    
Balance as of December 31, 2016 13,839 12,005  
CareDx [Member]      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Balance as of December 31, 2015 12,005    
Goodwill acquired 0    
Goodwill impairment 0    
Foreign currency translation adjustments 0    
Balance as of December 31, 2016 12,005 12,005  
Allenex [Member]      
Indefinite Lived Intangible Assets By Major Class [Line Items]      
Balance as of December 31, 2015 0    
Goodwill acquired 16,922    
Goodwill impairment (13,021)    
Foreign currency translation adjustments (2,067)    
Balance as of December 31, 2016 $ 1,834 $ 0