Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt

Schedule of components of convertible notes

The components of the convertible notes are as follows (in thousands):

				Carrying Amount,
	Interest Rates			September 30,		December 31,
Debt	September 30, 2018		Maturities	2018		2017
0.375% Convertible Senior Notes due 2018	0.375	%	2018	$	7,648		7,393
1.25% Convertible Senior Notes due 2020	1.25	%	2020		17,224		16,608
					24,872		24,001
Less current portion					7,648		7,393
				$	17,224	$	16,608

Schedule of carrying amount and fair value of convertible notes

The carrying amount and fair value of our convertible notes are as follows (in thousands):

	September 30, 2018				December 31, 2017
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
0.375% Convertible Senior Notes due 2018	$	7,648	$	10,271	$	7,393	$	14,129
1.25% Convertible Senior Notes due 2020		17,224		26,645		16,608		35,431
	$	24,872	$	36,916	$	24,001	$	49,560