Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Additional Information (Detail)

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Common Stock - Additional Information (Detail) - Non- employee Directors [Member] - 2012 Equity Incentive Plan [Member] - Restricted Stock [Member] - USD ($)
3 Months Ended 6 Months Ended
Mar. 16, 2015
Jun. 30, 2015
Jun. 30, 2015
Class of Stock [Line Items]      
Restricted shares awarded 40,000    
Restricted shares vest in each quarter end   10,000 20,000
Unrecognized compensation expense     $ 132,000