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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended
Mar. 02, 2017
USD ($)
Feb. 28, 2017
USD ($)
Feb. 28, 2017
SEK
Dec. 21, 2016
USD ($)
Dec. 21, 2016
SEK
Jul. 15, 2016
USD ($)
Apr. 25, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Loss Contingencies [Line Items]                      
Rent expense under non-cancelable operating leases               $ 1,500,000 $ 1,000,000 $ 1,000,000  
Damages sought           $ 1,300,000          
Fine by disciplinary committee       $ 100,000 SEK 1,000,000            
Subsequent Event [Member]                      
Loss Contingencies [Line Items]                      
Fine by disciplinary committee paid   $ 100,000 SEK 1,000,000                
Oberland Complaint [Member]                      
Loss Contingencies [Line Items]                      
Damages sought             $ 1,400,000        
Amount accrued for claim             $ 1,400,000 $ 600,000      
Oberland Complaint [Member] | Subsequent Event [Member]                      
Loss Contingencies [Line Items]                      
Settlement amount $ (600,000)                    
Unpaid Royalties [Member]                      
Loss Contingencies [Line Items]                      
Settlement and mutual release agreement, counterparty name               Roche      
Settlement and mutual release agreement, date               September 2014      
Past due royalties                     $ 2,827,220
Maximum number of days from end of calendar quarter for royalty payment               45 days      
Settlement and mutual release agreement, terms of agreement               In September 2014, the Company entered into a settlement and mutual release agreement with Roche whereby: (i) for the period beginning July 1, 2011 through June 30, 2014, the Company agreed to pay the amount of $2,827,220 in settlement of past royalties due; (ii) for the period beginning July 1, 2014 through September 30, 2014, the Company agreed to pay royalties based on the same combination services percentage used to determine the past royalties due; (iii) for the period beginning October 1, 2014 through September 30, 2017, Roche and the Company agreed to a downward adjustment of the combination services percentage used to determine the portion of the AlloMap testing revenue that is royalty bearing under the terms of the license; (iv) the Company agreed to report and pay quarterly royalties within 45 days of the end of each calendar quarter; (v) Roche agreed that, subject to the Company’s timely payment of all applicable royalties through such date, no further royalties will be payable by the Company for periods after September 30, 2017      
Royalty expenses               $ 1,100,000 $ 1,000,000 $ 700,000  
Allo Map                      
Loss Contingencies [Line Items]                      
Settlement and payment               2,800,000      
Decrease in cost of testing               600,000      
Decrease in interest expense               $ 100,000