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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Our Company Narrative (Details) - Subsequent Event - USD ($)
$ in Millions
Feb. 13, 2020
Feb. 19, 2020
Jan. 10, 2020
Convertible debt | 2021 Notes and 2024 Notes      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Repurchased aggregate principal amount   $ 188.0  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gralise      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration received     $ 127.5
Consideration received, base purchase price     $ 75.0
Consideration receivable as percentage of net sales after closing     75.00%
Threshold for consideration receivable on net sales after closing     $ 70.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | NUCYNTA      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from divestiture of businesses $ 375.0