FAIR VALUE (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 |
Carrying Amount | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | $ 1,144 | $ 10,824 |
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 | 430 | 1,269 |
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 | | 55 |
Carrying Amount | Mortgage-backed securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 1,993 |
Carrying Amount | Certificates of deposit | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 1,558 |
Carrying Amount | Corporate debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | 714 | 5,949 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 0 |
Estimate of Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 0 |
Estimate of Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | 0 | 0 |
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | 1,144 | 10,824 |
Estimate of Fair Value | 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 | 430 | 1,269 |
Estimate of Fair Value | 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 | | 55 |
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 1,993 |
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | Certificates of deposit | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 1,558 |
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | Corporate debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | 714 | 5,949 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | 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 |
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 0 |
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Certificates of deposit | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | | 0 |
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Corporate debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total available-for-sale securities | $ 0 | $ 0 |