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INVESTMENTS - Schedule of investments, available for sales securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Marketable securities | $ 57,357 | $ 0
Adjusted Cost Basis |  |
Marketable Securities [Line Items] |  |
Marketable securities | 57,357 |
Unrealized Gain (Loss) |  |
Marketable Securities [Line Items] |  |
Marketable securities | 0 |
Recorded Basis |  |
Marketable Securities [Line Items] |  |
Marketable securities | 57,357 |
Fair Value, Inputs, Level 2 |  |
Marketable Securities [Line Items] |  |
Marketable securities | 57,357 | $ 0
Fair Value, Inputs, Level 2 | Adjusted Cost Basis |  |
Marketable Securities [Line Items] |  |
Commercial paper | 9,994 |
Corporate notes and bonds | 47,363 |
Fair Value, Inputs, Level 2 | Unrealized Gain (Loss) |  |
Marketable Securities [Line Items] |  |
Commercial paper | 0 |
Corporate notes and bonds | 0 |
Fair Value, Inputs, Level 2 | Recorded Basis |  |
Marketable Securities [Line Items] |  |
Commercial paper | 9,994 |
Corporate notes and bonds | $ 47,363 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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