| Convertible Note Payable to Shareholder - Additional Information (Detail) (Convertible Promissory Note [Member], USD $) | 9 Months Ended | 
|---|---|
| Sep. 30, 2013 | |
| Convertible Promissory Note [Member] | |
| Debt Instrument [Line Items] | |
| Short-term note payable | $ 1,956,000 | 
| Interest rate on short-term note | 3.00% | 
| Final payment date of short-term note payable | Dec. 31, 2013 | 
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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