Quarterly report pursuant to Section 13 or 15(d)

Capital Stock - Additional Information (Detail)

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Capital Stock - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended
Apr. 10, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Oct. 31, 2013
Apr. 10, 2013
Apr. 10, 2013
Cleveland Clinic [Member]
Apr. 10, 2013
Series A Preferred Stock [Member]
Apr. 10, 2013
Series B Preferred Stock [Member]
Aug. 19, 2013
Secondary Offering [Member]
Sep. 05, 2013
Secondary Offering [Member]
Aug. 19, 2013
Secondary Offering [Member]
Oct. 28, 2013
Follow-On Offering [Member]
Oct. 28, 2013
Follow-On Offering [Member]
Class of Stock [Line Items]                            
Common stock, shares issued (in shares)   9,464,709   9,275,384 10,000 690,000 2,000         1,500,000   3,286,700
Underwriter's overallotment shares           90,000               428,700
Common stock sold at IPO, price per share           $ 10.00           $ 10.00   $ 14.00
Gross proceeds from public offering $ 6,900,000                 $ 15,000,000     $ 46,000,000  
Net proceeds from initial public offering 5,000,000 0 5,054,514                      
Value of debt converted 9,600,000                          
Conversion of debt into common stock 963,430                          
Number of shares converted to common stock               376,525 910,800          
Reclassification of derivative warrants 7,200,000 0 7,170,000                      
Net proceeds from secondary public offering                   13,300,000     42,300,000  
Amount used for repayment of certain indebtedness                       3,500,000    
Additional common stock sold at public offering                     105,000      
Gross proceeds from issuance of shares                     1,100,000      
Additional net proceeds from issuance of shares                     $ 947,000      
Preferred stock, shares authorized   9,764,000   9,764,000