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 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Apr. 10, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Oct. 31, 2013
Apr. 10, 2013
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]
Apr. 10, 2013
Cleveland Clinic [Member]
Apr. 10, 2013
Series A Preferred Stock [Member]
Apr. 10, 2013
Series B Preferred Stock [Member]
Class of Stock [Line Items]                            
Common stock, shares issued (in shares)   9,723,669   9,275,384 10,000 690,000     1,500,000   3,286,700 2,000    
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 4,984,025                      
Number of shares converted to common stock                         376,525 910,800
Value of debt converted 9,600,000                          
Conversion of debt into common stock 963,430                          
Conversion of preferred stock to common stock 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