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Share-Based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Incentive_Plan
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Jun. 30, 2013
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Dec. 31, 2012
JSOP Awards [Member]
Employees
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Dec. 31, 2010
JSOP Awards [Member]
Employees
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Jun. 30, 2014
Stock Options [Member]
Employees
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Jun. 30, 2013
Stock Options [Member]
Employees
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Jun. 30, 2014
Stock Options [Member]
Employees
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Jun. 30, 2013
Stock Options [Member]
Employees
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Jun. 30, 2014
Employee Stock Options [Member]
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Jun. 30, 2013
Employee Stock Options [Member]
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Jun. 30, 2014
Employee Stock Options [Member]
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Jun. 30, 2013
Employee Stock Options [Member]
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Jun. 30, 2014
Non-Employee Stock Options [Member]
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Jun. 30, 2013
Non-Employee Stock Options [Member]
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Jun. 30, 2014
Non-Employee Stock Options [Member]
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Jun. 30, 2013
Non-Employee Stock Options [Member]
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Jun. 30, 2014
Common Stock Awards [Member]
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Jun. 30, 2013
Common Stock Awards [Member]
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Jun. 30, 2014
Common Stock Awards [Member]
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Jun. 30, 2013
Common Stock Awards [Member]
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Jun. 30, 2014
2012 JSOP [Member]
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Jun. 30, 2013
2012 JSOP [Member]
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Jun. 30, 2014
2012 JSOP [Member]
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Jun. 30, 2013
2012 JSOP [Member]
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Dec. 31, 2012
2012 JSOP [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||
| Share-based compensation | $ 43,325 | $ 107,817 | $ 432,250 | $ 212,902 | $ 11,826 | $ 12,115 | $ 24,899 | $ 23,916 | $ 5,999 | $ 4,005 | $ 11,446 | $ 14,554 | $ 25,500 | $ 22,017 | $ 51,000 | $ 35,837 | $ 0 | $ 69,680 | $ 344,905 | $ 138,594 | |||||||
| Number of incentive stock plans | 2 | ||||||||||||||||||||||||||
| Acquisition date | Jan. 23, 2014 | ||||||||||||||||||||||||||
| Options exercised | 1,984,080 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||
| Number of employees, stock options granted | 0 | 0 | 0 | 0 | |||||||||||||||||||||||
| Cash received from stock options exercises | 101,933 | ||||||||||||||||||||||||||
| Options granted | 0 | 0 | 0 | 0 | 30,514 | 66,318 | 67,419 | 106,334 | |||||||||||||||||||
| Awards authorized but not issued | 0 | 0 | |||||||||||||||||||||||||
| Awards issued | 8,986,281 | 1,701,913 | |||||||||||||||||||||||||
| Number of employees, shares issued under JSOP | 2 | 2 | |||||||||||||||||||||||||
| Fair value of award | $ 853,889 | ||||||||||||||||||||||||||