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FAIR VALUE - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair value measurements |  |  |  |
Cash and cash equivalents | $ 148,695 | $ 77,491 | $ 39,206 | $ 48,921
Marketable securities | 893,474 | 347,224 |  |
Fair Value |  |  |  |
Fair value measurements |  |  |  |
Total | 1,042,169 | 424,715 |  |
Level 1 |  |  |  |
Fair value measurements |  |  |  |
Total | 101,103 | 61,297 |  |
Level 2 |  |  |  |
Fair value measurements |  |  |  |
Total | 941,066 | 363,418 |  |
Long-term debt | 4,400 | 4,500 |  |
Cash and money market | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 101,103 | 61,297 |  |
Cash and money market | Level 1 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 101,103 | 61,297 |  |
Corporate bonds | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 1,998 |  |  |
Marketable securities | 345,123 | 181,305 |  |
Corporate bonds | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 1,998 |  |  |
Marketable securities | 345,123 | 181,305 |  |
U.S. government agency securities | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 8,398 | 3,700 |  |
Marketable securities | 194,024 | 54,812 |  |
U.S. government agency securities | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 8,398 | 3,700 |  |
Marketable securities | 194,024 | 54,812 |  |
Asset backed securities | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 253,547 | 94,515 |  |
Asset backed securities | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Marketable securities | 253,547 | 94,515 |  |
Commercial paper. | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 11,998 | 10,995 |  |
Marketable securities | 51,994 | 9,946 |  |
Commercial paper. | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 11,998 | 10,995 |  |
Marketable securities | 51,994 | 9,946 |  |
Certificates of deposit | Fair Value |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 25,198 | 1,499 |  |
Marketable securities | 48,786 | 6,646 |  |
Certificates of deposit | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 25,198 | 1,499 |  |
Marketable securities | $ 48,786 | $ 6,646 |  |

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