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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2015
Cash and Cash Equivalents [Abstract] |
Summary of Available-for-Sale Marketable Securities | The following is a summary of available-for-sale marketable securities at December 31, 2014 and 2015:
|  | As at December 31, 2015 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale—matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Corporate bonds |  |  | 9,257 |  |  |  | 1 |  |  |  | (50 | ) |  |  | 9,208 |
|  |  | 9,258 |  |  |  | 1 |  |  |  | (50 | ) |  |  | 9,209 |
Available-for-sale—matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 39,501 |  |  |  | — |  |  |  | (444 | ) |  |  | 39,057 |
|  |  | 39,501 |  |  |  | — |  |  |  | (444 | ) |  |  | 39,057 |
Total |  | $ | 48,759 |  |  | $ | 1 |  |  | $ | (494 | ) |  | $ | 48,266 |
|  | As at December 31, 2014 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale—matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 5,443 |  |  | $ | — |  |  | $ | (46 | ) |  | $ | 5,397 |
|  |  | 5,443 |  |  |  | — |  |  |  | (46 | ) |  |  | 5,397 |
Available-for-sale—matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  |  | 1,975 |  |  |  | — |  |  |  | — |  |  |  | 1,975 |
Corporate bonds |  |  | 40,835 |  |  |  | 9 |  |  |  | (383 | ) |  |  | 40,461 |
|  |  | 42,810 |  |  |  | 9 |  |  |  | (383 | ) |  |  | 42,436 |
Total |  | $ | 48,253 |  |  | $ | 9 |  |  | $ | (429 | ) |  | $ | 47,833 |
Summary of Gross Unrealized Losses and Fair Values on Investments | The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2014 and 2015, and the length of time that those investments have been in a continuous loss position:
|  | Less than 12 months |  |  | 12 months or greater |
|  | Fair Value |  |  | Gross unrealized loss |  |  | Fair Value |  |  | Gross unrealized loss |
As of December 31, 2015 |  | $ | 32,695 |  |  | $ | (389 | ) |  | $ | 14,488 |  |  | $ | (105 | )
As of December 31, 2014 |  | $ | 34,152 |  |  | $ | (313 | ) |  | $ | 9,469 |  |  | $ | (116 | )
Summary of Gross Realized Gain and Loss from Sale of Available-for-Sale Marketable Securities | The following table presents gross realized gains and losses from sale of available-for-sale marketable securities:
|  | Year ended December 31, |
|  | 2013 |  |  | 2014 |  |  | 2015 |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 400 |  |  | $ | 99 |  |  | $ | 4 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (21 | ) |  | $ | (93 | ) |  | $ | (82 | )

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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