CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income (loss)	$ 41,230	$ (14,301)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Loss on extinguishment of convertible notes	31,608	0
Loss on prepayment of Senior Notes	8,233	0
Depreciation and amortization	8,068	25,990
Accretion of debt discount and debt issuance costs	5,387	6,164
Recurring fair value measurement of assets and liabilities	3,147	28
Stock-based compensation	1,934	2,702
Provision for inventory and other assets	1,554	359
Other	(14)	1,297
Changes in assets and liabilities:
Accounts receivable	29,792	(6,278)
Inventories	(2,381)	(40)
Prepaid and other assets	3,289	30,592
Accounts payable and other accrued liabilities	(10,510)	(12,361)
Accrued rebates, returns and discounts	(26,584)	(4,105)
Interest payable	(8,071)	(2,852)
Net cash (used in) provided by operating activities	(25,063)	27,195
Investing Activities
Purchases of property and equipment	(9)	(13)
Net cash provided by (used in) investing activities	449,036	(13)
Financing Activities
Proceeds from issuance of common stock	0	25
Shares withheld for payment of employee's withholding tax liability	(272)	(216)
Net cash used in financing activities	(360,107)	(28,440)
Net increase (decrease) in cash and cash equivalents	63,866	(1,258)
Cash and cash equivalents at beginning of year	42,107	110,949
Cash and cash equivalents at end of period	105,973	109,691
Supplemental Disclosure of Cash Flow Information
Net cash paid for income taxes	100	0
Cash paid for interest	10,842	13,213
Capital expenditures incurred but not yet paid	0	130
Senior Notes
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Loss on extinguishment of convertible notes	8,200
Accretion of debt discount and debt issuance costs	2,699	1,357
Financing Activities
Payments in connection with debt payment	(171,775)	(28,249)
Convertible debt
Financing Activities
Payments in connection with debt payment	(188,060)	0
Gralise
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Gain (Loss) on sale of assets	(127,500)	0
Investing Activities
Proceeds from sale of assets	81,087	0
NUCYNTA
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Gain (Loss) on sale of assets	15,755	0
Investing Activities
Proceeds from sale of assets	$ 367,958	$ 0