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Collaboration and Licensing Agreements - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jul. 31, 2013
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2013
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2013
EUR (€)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Description of agreement expire term       The agreement will expire at the later of the last-to-expire patent in the EEA or ten years from the first commercial sale of the test in the EEA, which occurred in 2014.      
Common stock value       $ 21,000 $ 12,000    
Refundable upfront payments   $ 263,000 € 250,000        
Upfront cash payment   408,000 € 387,500        
Revenues recognized from the arrangement       2,000 46,000 $ 36,000  
Royalty revenues       194,000 179,000 $ 221,000  
Royalty revenues receivable balance       $ 0 $ 0    
Diaxonhit [Member]              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Common stock value   $ 408,000         € 387,500
Shares sold for consideration $ 467,000