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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Description of Business and Basis of Presentation (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2018 USD ($) product	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) product	Sep. 30, 2017 USD ($)	Nov. 08, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Number of commercial products \| product	2				2
Net income (loss)	$ 24,808,000	$ 31,262,000	$ 32,828,000	$ 49,744,000	$ 88,898,000	$ 102,142,000
Cash used to fund operating activities					46,257,000	$ 39,104,000
Convertible Notes
Debt Instrument [Line Items]
Principal amount of convertible notes	$ 302,500,000				$ 302,500,000
Debt instrument, stated interest rate percentage	2.00%				2.00%
Loan aggregate amount	$ 324,998,000				$ 324,998,000			$ 324,998,000
Note payable under term loan	$ 331,498,000				$ 331,498,000
Bridge Credit Agreement \| Subsequent Event \| Secured Debt
Debt Instrument [Line Items]
Loan aggregate amount							$ 72,500,000
Intercompany Loan
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage	8.00%				8.00%
Note payable under term loan	$ 36,800,000				$ 36,800,000
Intercompany Loan \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage							8.50%
Note payable under term loan							$ 3,500,000