Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2018

Carrying Value of 2018 Convertible Notes

The carrying value of the 2013 Convertible Notes as of December 31, 2017, is summarized as follows:



	Year Ended December 31, 2017
Principal amount	$	40,565
(Less): Unamortized debt discount (amortized through December 2018)	(2,101		)
(Less): Debt issuance costs	(240		)
Carrying value	$	38,224

Components of Total Interest Expense, Net Recognized

The following table sets forth the components of interest expense recognized in the accompanying Consolidated Statements of Operations for the 2013 Convertible Notes for the years ended December 31, 2018, 2017, and 2016:



	Year Ended December 31,
	2018			2017			2016
Contractual coupon interest expense	$	981		$	2,615		$	3,288
Amortization of debt issuance costs	220			567			696
Accretion of debt discount	1,931			4,890			5,710
Total	$	3,132		$	8,072		$	9,694
Effective interest rate	8.41		%	8.41		%	8.65		%

- 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