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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Levels of fair value measurements of financial assets:
Marketable Securities	$ 23,433		$ 0
Fair Value, Recurring [Member]
Fair Value Assets and Liabitlies Measured on a Recurring and Nonrecurring Basis [Line Items]
Restricted cash		$ 1,000
Levels of fair value measurements of financial assets:
Marketable Securities	23,433
Restricted Cash and Investments, Current	24,433
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value Assets and Liabitlies Measured on a Recurring and Nonrecurring Basis [Line Items]
Restricted cash		1,000
Levels of fair value measurements of financial assets:
Marketable Securities	23,433
Restricted Cash and Investments, Current	24,433
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2
Fair Value Assets and Liabitlies Measured on a Recurring and Nonrecurring Basis [Line Items]
Restricted cash		0
Levels of fair value measurements of financial assets:
Marketable Securities	0
Restricted Cash and Investments, Current	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3
Fair Value Assets and Liabitlies Measured on a Recurring and Nonrecurring Basis [Line Items]
Restricted cash		$ 0
Levels of fair value measurements of financial assets:
Marketable Securities	0
Restricted Cash and Investments, Current	$ 0

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Amount of investment in marketable security.

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-Publisher FASB
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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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