Debt Tables (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Extinguishment of Debt [Table Text Block]

The following table summarizes information about the settlement of the Convertible Senior Notes (in thousands):



	Year ended December 30, 2018
Principal amount settled	$	108,811
Number of shares of common stock issued	3,699
Loss on extinguishment of debt	$	2,303

Schedule of Long-term Debt Instruments

The following table summarizes information about the equity and liability components of the Convertible Senior Notes (dollars in thousands). The fair values of the respective notes outstanding were measured based on quoted market prices:



	December 31,
	2018			2017
Principal amount of Convertible Senior Notes outstanding	$	58,503		$	167,314
Unamortized discount of liability component	(3,637		)	(15,356		)
Unamortized deferred issuance costs	(487		)	(2,090		)
Net carrying amount of liability component	54,379			149,868
Less: current portion	54,379			—
Long-term debt	$	—		$	149,868
Carrying value of equity component, net of issuance costs	$	10,092		$	29,211
Fair value of outstanding Convertible Senior Notes	$	85,999		$	257,245
Remaining amortization period of discount on the liability component	2 years			3 years

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details