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SIGNIFICANT ACCOUNTING POLICIES (Financial Assets Measured on a Recurring Basis) (Details) - Recurring $ in Thousands | Dec. 31, 2017 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | $ 40,227
Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 3,855
Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 36,372
Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Commercial paper |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 2,048
Commercial paper | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Commercial paper | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 2,048
Commercial paper | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Total cash equivalents |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 2,048
Total cash equivalents | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Total cash equivalents | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 2,048
Total cash equivalents | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
U.S. Treasury securities |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 3,855
U.S. Treasury securities | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 3,855
U.S. Treasury securities | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
U.S. Treasury securities | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Corporate notes and bonds |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 32,729
Corporate notes and bonds | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Corporate notes and bonds | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 32,729
Corporate notes and bonds | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Commercial paper |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 1,595
Commercial paper | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Commercial paper | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 1,595
Commercial paper | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 0
Total short-term marketable securities |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 38,179
Total short-term marketable securities | Level 1 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 3,855
Total short-term marketable securities | Level 2 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | 34,324
Total short-term marketable securities | Level 3 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Total financial assets | $ 0

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