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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating activities      
Net (loss) income $ (25,002) $ 71,517 $ 26,752
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Amortization and impairment expense 136,255 67,181 60,680
Depreciation expense 2,684 1,736 870
Deferred income taxes (8,391) (78,042)  
Stock-based compensation expense 22,874 24,255 21,910
Non-cash lease expense 238 18 57
Non-cash interest expense for amortization of debt discount and issuance costs 8,285 3,406 8,972
Changes in operating assets and liabilities:      
Accounts receivable (21,780) (22,524) (10,367)
Inventory 48,274 (2,296) (8,270)
Prepaid expenses and other assets (4,606) (1,086) (1,598)
Accounts payable (707) (5,827) 3,769
Accrued expenses (11,131) 4,777 (7,838)
Accrued rebates, returns and discounts (22,766) 40,442 (995)
Operating lease assets and liabilities 3    
Net cash provided by operating activities 124,230 103,557 93,942
Investing activities      
Purchase of intangible asset     (368,226)
Purchases of property and equipment (1,622) (1,944) (5,546)
Acquisition of BDSI (net of cash acquired) (572,069)    
Net cash used in investing activities (573,691) (1,944) (373,772)
Financing activities      
Proceeds from issuances of common stock from employee stock purchase plans 337 755 758
Proceeds from the exercise of stock options 11,811 11,952 6,577
Payments made for employee stock tax withholdings (4,044) (4,149) (2,255)
Repurchases of common stock (14,063) (47,861)  
Proceeds from issuance of term note, net of issuance costs of $2,456     192,117
Proceeds from convertible senior notes, net of issuance costs of $5,473     138,277
Repayment of term notes (75,000) (50,000) (37,500)
Proceeds from term note modification 517,682    
Repayment of term loan     (11,500)
Net cash provided by (used in) financing activities 436,723 (89,303) 286,474
Net (decrease) increase in cash, cash equivalents and restricted cash (12,738) 12,310 6,644
Cash, cash equivalents and restricted cash at beginning of year 188,973 176,663 170,019
Cash, cash equivalents and restricted cash at end of year 176,235 188,973 176,663
Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets:      
Cash and cash equivalents 173,688 186,426 174,116
Restricted cash 2,547 2,547 2,547
Total cash, cash equivalents and restricted cash 176,235 188,973 176,663
Supplemental disclosure of cash flow information      
Cash paid for interest 52,528 17,608 18,967
Cash paid for income taxes 10,400 3,005 483
Supplemental disclosure of non-cash activities      
Acquisition of property and equipment in accounts payable and accrued expenses   72 293
Accrued royalties discharged upon closing of asset acquisition     1,145
Inventory used in the construction and installation of property and equipment $ 0 $ 516 2,299
Receivable from stock option exercises in other current assets     $ 80