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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of cost and estimated fair value of short-term investments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Maturing in one year or less | $ 272,381 | $ 282,046
Maturing after one year through five years | 5,000 | 21,832
Total | $ 277,381 | $ 303,878

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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