Quarterly report pursuant to Section 13 or 15(d)

Organization, Description of Business, Basis of Presentation, Acquisitions and Recent Accounting Pronouncements - Additional Information (Detail)

v3.5.0.2
Organization, Description of Business, Basis of Presentation, Acquisitions and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 25, 2016
Oct. 09, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]            
Revenue     $ 7,001 $ 4,185 $ 13,069 $ 8,555
Shares issued 2,467,820          
Proceeds from offering $ 5,000          
Response Genetics, Inc.            
Business Acquisition [Line Items]            
Consideration transferred   $ 12,900        
Consideration transferred, amount paid in cash   $ 7,500        
Consideration transferred, common stock paid (in shares)   788,584        
Consideration transferred, common stock value   $ 5,400        
Response Genetics, Inc.            
Business Acquisition [Line Items]            
Revenue     $ 2,044   $ 4,207  
2016 Offering            
Business Acquisition [Line Items]            
Warrants, number of shares of common stock with right to purchase 1,233,910          
Warrants, period before exercisable 6 months          
Warrants, exercise price (in dollars per share) $ 2.25          
Warrants, exercise period 5 years          
Institutional Investors            
Business Acquisition [Line Items]            
Shares issued 2,150,000          
Warrants, number of shares of common stock with right to purchase 1,075,000          
Warrants, combined offering price (in dollars per share) $ 2.00          
Placement Agent            
Business Acquisition [Line Items]            
Warrants, number of shares of common stock with right to purchase 123,391          
Chairman of the Board            
Business Acquisition [Line Items]            
Shares issued 317,820          
Warrants, combined offering price (in dollars per share) $ 2.2025          
Chairman of the Board | 2016 Offering            
Business Acquisition [Line Items]            
Warrants, number of shares of common stock with right to purchase 158,910