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FAIR VALUE - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair value measurements |  |  |  |
Cash and cash equivalents | $ 52,151 | $ 41,135 | $ 40,679 | $ 58,131
Marketable securities | 210,441 | 265,744 |  |
Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Total | 262,592 | 306,879 |  |
Fair Value Inputs Level 1 |  |  |  |
Fair value measurements |  |  |  |
Total | 38,151 | 37,435 |  |
Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Total | 224,441 | 269,444 |  |
Long-term debt | 4,800 | 4,800 |  |
Cash and Money Market | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 38,151 | 37,435 |  |
Cash and Money Market | Fair Value Inputs Level 1 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 38,151 | 37,435 |  |
Corporate bonds | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 132,906 | 179,211 |  |
Corporate bonds | Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 132,906 | 179,211 |  |
U.S. government agency securities | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 7,065 | 7,039 |  |
U.S. government agency securities | Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 7,065 | 7,039 |  |
Asset backed securities | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 62,348 | 77,495 |  |
Asset backed securities | Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 62,348 | 77,495 |  |
Commercial Paper. | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents |  | 3,700 |  |
Marketable securities | 2,620 |  |  |
Commercial Paper. | Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents |  | 3,700 |  |
Marketable securities | 2,620 |  |  |
Certificates of deposit | Estimate Of Fair Value Fair Value Disclosure |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 14,000 |  |  |
Marketable securities | 5,502 | 1,999 |  |
Certificates of deposit | Fair Value Inputs Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 14,000 |  |  |
Marketable securities | $ 5,502 | $ 1,999 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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