Quarterly report pursuant to Section 13 or 15(d)

Preferred Stock Issuance - Additional Information (Detail)

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Preferred Stock Issuance - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
May. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Subsidiary, Sale of Stock [Line Items]      
Private placement amount $ 10,000,000   $ 9,449,683
Base conversion price per share     $ 1.84
Private Placement [Member]      
Subsidiary, Sale of Stock [Line Items]      
Sale of common stock, value $ 3,000,000    
Sale of common stock, shares 2,000,000    
Sale of common stock, price per share $ 1.50    
Series A Preferred Stock [Member]      
Subsidiary, Sale of Stock [Line Items]      
Convertible preferred stock, shares issued 7,000    
Convertible preferred stock stated value per share $ 1,000    
Convertible preferred stock, value $ 7,000,000    
Liquidation preference percentage 100.00%    
Base conversion price per share $ 2.545    
Conversion price if threshold prices not achieved   $ 1.50  
Convertible Preferred Stock, Terms of Conversion   The Series A Stock is entitled to a liquidation preference in an amount equal to the greater of 100% of its $1,000 per share stated value plus an amount equal to any then accrued and unpaid dividends, or the amount the Series A Stock would receive if all the outstanding shares of Series A Stock had been converted into common stock at $2.545 per share, subject to adjustment in accordance with the terms and provisions of the Certificate of Incorporation (the “base conversion price”). The Series A Stock is convertible into common stock at the base conversion price at the option of the holder or mandatorily convertible into common stock on May 13, 2019, at the base conversion price provided that certain “threshold” prices have been achieved during the 360 calendar day period prior to such date. If those threshold prices have not been achieved, the Series A Stock will convert at $1.50 per share on May 13, 2019.