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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Of Marketable Securities and Investments [Table Text Block] | The fair value hierarchy of the Company’s cash equivalents and marketable securities at December 31, 2017, and December 31, 2016, was as follows:
| Fair Value Measurement at
| December 31, 2017
(in thousands) | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2)
Corporate securities | $ | 179,951 |  |  | $ | — |  |  | $ | 179,951 |
Commercial paper | 51,122 |  |  | — |  |  | 51,122 |
Government securities | 9,285 |  |  | — |  |  | 9,285 |
Money market funds | 195 |  |  | 195 |  |  | — |
Total | $ | 240,553 |  |  | $ | 195 |  |  | $ | 240,358 |
| Fair Value Measurement at
| December 31, 2016
(in thousands) | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2)
Corporate securities | $ | 132,141 |  |  | $ | — |  |  | $ | 132,141 |
Commercial paper | 58,031 |  |  | — |  |  | 58,031 |
Money market funds | 1,916 |  |  | 1,916 |  |  | — |
Total | $ | 192,088 |  |  | $ | 1,916 |  |  | $ | 190,172 |

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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