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The percentage above the last reported sale price of the Company's common stock.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Price of a single share of a number of saleable stocks of a company.

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DEBT - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 01, 2017 $ / shares
Liability component
Principal		$ 433,484	$ 433,484
Unamortized debt discount and issuance costs		(47,967)	(56,364)
Common stock
Debt
Share Price \| $ / shares					$ 13.28
2025 Notes
Debt
Debt discount			67,300
Convertible senior notes \| 2025 Notes
Liability component
Principal		192,500	192,500
Unamortized debt discount and issuance costs		(46,766)	(54,597)
Net carrying amount		145,734	137,903
Equity component, net		65,361	65,361
Interest expense
Contractual interest expense		4,813	4,813	$ 4,799
Amortization of debt issuance costs		601	551	505
Amortization of debt discount		7,230	6,618	6,071
Total interest and amortization expense		$ 12,644	$ 11,982	$ 11,375
Convertible senior notes \| 2025 Notes \| Over-Allotment Option
Debt
Loan amount	$ 17,500
Convertible senior notes \| 2025 Notes \| Private Placement
Debt
Loan amount	$ 192,500
Interest rate (as a percent)	2.50%
Convertible senior notes \| 2025 Notes \| Common stock
Debt
Conversion rate for shares of common stock per $1,000 principal	57.9240
Conversion price (dollars per share) \| $ / shares	$ 17.26
Conversion premium (as a percent)	30.00%