FAIR VALUE MEASUREMENTS - Financial assets and liabilities that are measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Debt securities, available-for-sale, fair value	$ 261,851
Liabilities
Warrant liability	9,787	$ 0
Fair Value, Recurring
Assets
Cash	124,782
Debt securities, available-for-sale, fair value	261,851
Total assets	390,933	60,529
Liabilities
Warrant liability	9,787
Derivative liabilities		13,390
Total liabilities	9,787	13,390
Fair Value, Recurring \| Trading securities (convertible promissory notes)
Assets
Debt securities, trading securities, fair value	4,300
Fair Value, Recurring \| Cash
Assets
Cash	8,983	1,244
Fair Value, Recurring \| Money market funds
Assets
Cash	115,799	59,285
Level 1 \| Fair Value, Recurring
Assets
Cash	124,782
Debt securities, available-for-sale, fair value	0
Total assets	124,782	60,529
Liabilities
Warrant liability	0
Derivative liabilities		0
Total liabilities	0	0
Level 1 \| Fair Value, Recurring \| Trading securities (convertible promissory notes)
Assets
Debt securities, trading securities, fair value	0
Level 1 \| Fair Value, Recurring \| Cash
Assets
Cash	8,983	1,244
Level 1 \| Fair Value, Recurring \| Money market funds
Assets
Cash	115,799	59,285
Level 2 \| Fair Value, Recurring
Assets
Cash	0
Debt securities, available-for-sale, fair value	261,851
Total assets	261,851	0
Liabilities
Warrant liability	9,787
Derivative liabilities		0
Total liabilities	9,787	0
Level 2 \| Fair Value, Recurring \| Trading securities (convertible promissory notes)
Assets
Debt securities, trading securities, fair value	0
Level 2 \| Fair Value, Recurring \| Cash
Assets
Cash	0	0
Level 2 \| Fair Value, Recurring \| Money market funds
Assets
Cash	0	0
Level 3 \| Fair Value, Recurring
Assets
Cash	0
Debt securities, available-for-sale, fair value	0
Total assets	4,300	0
Liabilities
Warrant liability	0
Derivative liabilities		13,390
Total liabilities	0	13,390
Level 3 \| Fair Value, Recurring \| Trading securities (convertible promissory notes)
Assets
Debt securities, trading securities, fair value	4,300
Level 3 \| Fair Value, Recurring \| Cash
Assets
Cash	0	0
Level 3 \| Fair Value, Recurring \| Money market funds
Assets
Cash	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Fair value of financial and nonfinancial obligations.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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