Quarterly report pursuant to Section 13 or 15(d)

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

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Organization, Description of Business, Basis of Presentation, Acquisitions and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 14, 2016
May 25, 2016
Oct. 09, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]              
Revenue       $ 6,750,000 $ 4,001,000 $ 19,819,000 $ 12,556,000
Shares issued (in shares) 2,750,000 2,467,820          
Proceeds from offering $ 5,500,000.0 $ 5,000,000          
Warrants, number of shares of common stock with right to purchase (in shares) 137,500            
Warrants, combined offering price (usd per share) $ 2.00            
Response Genetics, Inc.              
Business Acquisition [Line Items]              
Consideration transferred     $ 12,900,000        
Consideration transferred, amount paid in cash     $ 7,500,000        
Consideration transferred, common stock paid (in shares)     788,584        
Consideration transferred, common stock value     $ 5,400,000        
Response Genetics, Inc.              
Business Acquisition [Line Items]              
Revenue       $ 2,003,000   $ 6,210,000  
2016 Offerings              
Business Acquisition [Line Items]              
Warrants, number of shares of common stock with right to purchase (in shares) 1,375,000 1,233,910          
Warrants, period before exercisable   6 months          
Warrants, exercise price (usd per share) $ 2.25 $ 2.25          
Warrants, exercise period 5 years 5 years          
Institutional Investors              
Business Acquisition [Line Items]              
Shares issued (in shares)   2,150,000          
Warrants, number of shares of common stock with right to purchase (in shares)   1,075,000          
Warrants, combined offering price (usd per share)   $ 2.00          
Placement Agent              
Business Acquisition [Line Items]              
Warrants, number of shares of common stock with right to purchase (in shares)   123,391          
Private Placement - September Offering              
Business Acquisition [Line Items]              
Warrants, number of shares of common stock with right to purchase (in shares) 1,375,000            
Warrants, exercise price (usd per share) $ 2.25            
Warrants, exercise period 5 years            
Chairman of the Board              
Business Acquisition [Line Items]              
Shares issued (in shares)   317,820          
Warrants, combined offering price (usd per share)   $ 2.2025          
Chairman of the Board | 2016 Offerings              
Business Acquisition [Line Items]              
Warrants, number of shares of common stock with right to purchase (in shares)   158,910