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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES |
Schedule of financial assets and liabilities recorded at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
June 30, 2021 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash | ​ | $ | 760,217 | ​ | $ | — | ​ | $ | — | ​ | $ | 760,217
Money market funds | ​ |  | 809,022 | ​ |  | — | ​ |  | — | ​ |  | 809,022
Certificates of deposit | ​ | ​ | — | ​ | ​ | 43,242 | ​ | ​ | — | ​ | ​ | 43,242
Commercial paper | ​ |  | — | ​ |  | 186,912 | ​ |  | — | ​ |  | 186,912
U.S. government agency securities | ​ |  | — | ​ |  | 94,573 | ​ |  | — | ​ |  | 94,573
U.S. treasuries | ​ | ​ | — | ​ | ​ | 750,258 | ​ | ​ | — | ​ | ​ | 750,258
Foreign currency derivatives | ​ |  | — | ​ |  | 291 | ​ |  | — | ​ |  | 291
Total | ​ | $ | 1,569,239 | ​ | $ | 1,075,276 | ​ | $ | — | ​ | $ | 2,644,515
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts included in: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 1,569,239 | ​ | $ | 15,000 | ​ | $ | — | ​ | $ | 1,584,239
Short-term investments | ​ |  | — | ​ |  | 968,952 | ​ |  | — | ​ |  | 968,952
Accounts receivable, net | ​ |  | — | ​ |  | 609 | ​ |  | — | ​ |  | 609
Investments | ​ |  | — | ​ |  | 91,033 | ​ |  | — | ​ |  | 91,033
Accrued liabilities | ​ |  | — | ​ |  | (318) | ​ |  | — | ​ |  | (318)
Total | ​ | $ | 1,569,239 | ​ | $ | 1,075,276 | ​ | $ | — | ​ | $ | 2,644,515
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash | ​ | $ | 796,421 | ​ | $ | — | ​ | $ | — | ​ | $ | 796,421
Money market funds | ​ |  | 352,730 | ​ |  | — | ​ |  | — | ​ |  | 352,730
Certificates of deposit | ​ | ​ | — | ​ | ​ | 23,137 | ​ | ​ | — | ​ | ​ | 23,137
Commercial paper | ​ |  | — | ​ |  | 130,883 | ​ |  | — | ​ |  | 130,883
Municipal securities | ​ |  | — | ​ |  | 9,083 | ​ |  | — | ​ |  | 9,083
U.S. government agency securities | ​ |  | — | ​ |  | 91,882 | ​ |  | — | ​ |  | 91,882
U.S. treasuries | ​ | ​ | — | ​ | ​ | 701,922 | ​ | ​ | — | ​ | ​ | 701,922
Foreign currency derivatives | ​ |  | — | ​ |  | (2,578) | ​ |  | — | ​ |  | (2,578)
Total | ​ | $ | 1,149,151 | ​ | $ | 954,329 | ​ | $ | — | ​ | $ | 2,103,480
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts included in: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 1,149,151 | ​ | $ | 31,262 | ​ | $ | — | ​ | $ | 1,180,413
Short-term investments | ​ |  | — | ​ |  | 881,354 | ​ |  | — | ​ |  | 881,354
Accounts receivable, net | ​ |  | — | ​ |  | 69 | ​ |  | — | ​ |  | 69
Investments | ​ |  | — | ​ |  | 44,291 | ​ |  | — | ​ |  | 44,291
Accrued liabilities | ​ |  | — | ​ |  | (2,647) | ​ |  | — | ​ |  | (2,647)
Total | ​ | $ | 1,149,151 | ​ | $ | 954,329 | ​ | $ | — | ​ | $ | 2,103,480
​

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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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