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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Effect on consolidation balance sheet as result of adopting ASC 842 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right-of-use lease assets | $ 74 | $ 2,252 |  |
Lease liabilities - current | 39 | 1,785 |  |
Lease liabilities - non-current | 26 | 810 |  |
Prepaid expenses and other current assets | 43,624 | 27,586 |  | $ 38,714
Accrued expenses and other current liabilities | $ (14,683) | $ (17,302) |  | $ (10,644)
Effect of adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right-of-use lease assets |  |  | $ 5,141 |
Lease liabilities - current |  |  | (1,760) |
Lease liabilities - non-current |  |  | (1,975) |
Prepaid expenses and other current assets |  |  | (1,422) |
Accrued expenses and other current liabilities |  |  | 16 |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right-of-use lease assets |  |  | 5,141 |
Lease liabilities - current |  |  | (1,760) |
Lease liabilities - non-current |  |  | (1,975) |
Prepaid expenses and other current assets |  |  | 37,292 |
Accrued expenses and other current liabilities |  |  | $ (10,628) |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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