FAIR VALUE - Schedule of Fair Value Hierarchy for Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Liabilities:
Contingent consideration, current portion	$ 8,700	$ 0
Contingent consideration	20,859	168
Recurring
Assets:
Total	77	9,629
Liabilities:
Contingent consideration, current portion	8,700
Contingent consideration	20,859
Contingent consideration liability		168
Total	29,559	168
Recurring \| Money market funds
Assets:
Cash and cash equivalents	77
Recurring \| Collegium warrants
Assets:
Investments		9,629
Recurring \| Level 1
Assets:
Total	77	0
Liabilities:
Contingent consideration, current portion	0
Contingent consideration	0
Contingent consideration liability		0
Total	0	0
Recurring \| Level 1 \| Money market funds
Assets:
Cash and cash equivalents	77
Recurring \| Level 1 \| Collegium warrants
Assets:
Investments		0
Recurring \| Level 2
Assets:
Total	0	9,629
Liabilities:
Contingent consideration, current portion	0
Contingent consideration	0
Contingent consideration liability		0
Total	0	0
Recurring \| Level 2 \| Money market funds
Assets:
Cash and cash equivalents	0
Recurring \| Level 2 \| Collegium warrants
Assets:
Investments		9,629
Recurring \| Level 3
Assets:
Total	0	0
Liabilities:
Contingent consideration, current portion	8,700
Contingent consideration	20,859
Contingent consideration liability		168
Total	29,559	168
Recurring \| Level 3 \| Money market funds
Assets:
Cash and cash equivalents	$ 0
Recurring \| Level 3 \| Collegium warrants
Assets:
Investments		$ 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 liability recognized arising from contingent consideration in a business combination.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Fair value of financial and nonfinancial obligations.

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