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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property, Plant and Equipment [Line Items] |  |  |
Number of shares sold | 24,000,000 |  |
Proceeds from sale of subsidiary stock | $ 27,500,000 |  |
Ratio of remaining net proceed | 0.25 |  |
Short-term investment maturity period | Three months or less |  |
Securities owned | $ 0 |  |
Weighted average number of common shares outstanding | 80,128,827 | 73,889,112 | 70,179,935
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful life | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, estimated useful life | 10 years |  |

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