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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2020
FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES |
Schedule of financial assets and liabilities recorded at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2020 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash | ​ | $ | 497,556 | ​ | $ | — | ​ | $ | — | ​ | $ | 497,556
Money market funds | ​ |  | 194,560 | ​ |  | — | ​ |  | — | ​ |  | 194,560
Certificates of deposit | ​ | ​ | — | ​ | ​ | 1,607 | ​ | ​ | — | ​ | ​ | 1,607
Commercial paper | ​ |  | — | ​ |  | 57,107 | ​ |  | — | ​ |  | 57,107
Variable rate demand notes | ​ | ​ | — | ​ | ​ | 12,628 | ​ | ​ | — | ​ | ​ | 12,628
Municipal securities | ​ |  | — | ​ |  | 106,292 | ​ |  | — | ​ |  | 106,292
U.S. government agency securities | ​ |  | — | ​ |  | 28,931 | ​ |  | — | ​ |  | 28,931
U.S. treasuries | ​ | ​ | — | ​ | ​ | 50,590 | ​ | ​ | — | ​ | ​ | 50,590
Foreign currency derivatives | ​ |  | — | ​ |  | (301) | ​ |  | — | ​ |  | (301)
Total | ​ | $ | 692,116 | ​ | $ | 256,854 | ​ | $ | — | ​ | $ | 948,970
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts included in: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 692,116 | ​ | $ | 9,720 | ​ | $ | — | ​ | $ | 701,836
Short-term investments | ​ |  | — | ​ |  | 233,513 | ​ |  | — | ​ |  | 233,513
Accounts receivable, net | ​ |  | — | ​ |  | 203 | ​ |  | — | ​ |  | 203
Investments | ​ | ​ | — | ​ | ​ | 13,922 | ​ | ​ | — | ​ | ​ | 13,922
Accrued liabilities | ​ |  | — | ​ |  | (504) | ​ |  | — | ​ |  | (504)
Total | ​ | $ | 692,116 | ​ | $ | 256,854 | ​ | $ | — | ​ | $ | 948,970
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash | ​ | $ | 518,178 | ​ | $ | — | ​ | $ | — | ​ | $ | 518,178
Money market funds | ​ |  | 191,131 | ​ |  | — | ​ |  | — | ​ |  | 191,131
Certificates of deposit | ​ | ​ | — | ​ | ​ | 28,049 | ​ | ​ | — | ​ | ​ | 28,049
Commercial paper | ​ |  | — | ​ |  | 96,867 | ​ |  | — | ​ |  | 96,867
Variable rate demand notes | ​ |  | — | ​ |  | 21,680 | ​ |  | — | ​ |  | 21,680
Municipal securities | ​ |  | — | ​ |  | 167,224 | ​ |  | — | ​ |  | 167,224
U.S. government agency securities | ​ |  | — | ​ |  | 73,634 | ​ |  | — | ​ |  | 73,634
U.S. treasuries | ​ | ​ | — | ​ | ​ | 247,162 | ​ | ​ | — | ​ | ​ | 247,162
Foreign currency derivatives | ​ |  | — | ​ |  | (687) | ​ |  | — | ​ |  | (687)
Total | ​ | $ | 709,309 | ​ | $ | 633,929 | ​ | $ | — | ​ | $ | 1,343,238
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts included in: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 709,309 | ​ | $ | 88,648 | ​ | $ | — | ​ | $ | 797,957
Short-term investments | ​ |  | — | ​ |  | 533,063 | ​ |  | — | ​ |  | 533,063
Accounts receivable, net | ​ |  | — | ​ |  | 329 | ​ |  | — | ​ |  | 329
Investments | ​ | ​ | — | ​ | ​ | 12,905 | ​ | ​ | — | ​ | ​ | 12,905
Accrued liabilities | ​ |  | — | ​ |  | (1,016) | ​ |  | — | ​ |  | (1,016)
Total | ​ | $ | 709,309 | ​ | $ | 633,929 | ​ | $ | — | ​ | $ | 1,343,238
​

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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