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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash And Cash Equivalents [Abstract] |
Schedule of Cash, Cash Equivalents and Investments | Investments as of December 31, 2017 and December 31, 2016 consisted of the following (in thousands):
|  | Amortized |  |  | Unrealized |  |  | Aggregate Fair |
Investment Classification |  | Cost |  |  | Gains |  |  | (Losses) |  |  | Market Value |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 1,296 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | 1,296 |
Corporate bonds |  |  | 104,626 |  |  |  | — |  |  |  | (252 | ) |  |  | 104,374 |
U.S. Government bonds |  |  | 214,641 |  |  |  | — |  |  |  | (139 | ) |  |  | 214,502 |
|  | $ | 320,563 |  |  | $ | 1 |  |  | $ | (392 | ) |  | $ | 320,172 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 3,362 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3,365 |
Money market instruments |  |  | 2,998 |  |  |  | — |  |  |  | (2 | ) |  |  | 2,996 |
Corporate bonds |  |  | 209,595 |  |  |  | 6 |  |  |  | (377 | ) |  |  | 209,224 |
U.S. Government bonds |  |  | 32,996 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 32,994 |
|  | $ | 248,951 |  |  | $ | 10 |  |  | $ | (382 | ) |  | $ | 248,579 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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