FAIR VALUE - Carrying Amounts and Fair Values of Certain Assets and Liabilities (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 |
Carrying Amount | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | $10,699,265 | $10,674,609 |
Carrying Amount | Short-term investments (money market funds and accrued income) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 2,719,151 | 449,420 |
Carrying Amount | Mortgaged-backed securities | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 84,179 | 95,604 |
Carrying Amount | Obligations of U.S. Treasury, U.S. government corporations and agencies | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 2,920,543 | 2,381,779 |
Carrying Amount | Corporate bonds | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 4,975,392 | 7,747,806 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments (money market funds and accrued income) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgaged-backed securities | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Treasury, U.S. government corporations and agencies | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Significant Other Observable Inputs (Level 2) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 10,699,265 | 10,674,609 |
Significant Other Observable Inputs (Level 2) | Short-term investments (money market funds and accrued income) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 2,719,151 | 449,420 |
Significant Other Observable Inputs (Level 2) | Mortgaged-backed securities | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 84,179 | 95,604 |
Significant Other Observable Inputs (Level 2) | Obligations of U.S. Treasury, U.S. government corporations and agencies | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 2,920,543 | 2,381,779 |
Significant Other Observable Inputs (Level 2) | Corporate bonds | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 4,975,392 | 7,747,806 |
Significant Unobservable Inputs (Level 3) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Short-term investments (money market funds and accrued income) | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Mortgaged-backed securities | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Obligations of U.S. Treasury, U.S. government corporations and agencies | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate bonds | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total available-for-sale securities | $0 | $0 |