Debt and Credit Facilities Debt and Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2018

Debt Instrument [Line Items]

Schedule of carrying value of the Notes

The carrying value of the Notes is as follows (in thousands):

	March 31, 2018			December 31, 2017
Principal amount	$	46,000		$	46,000
Unamortized debt discount - equity component	(7,817		)	(8,144		)
Unamortized debt discount - initial purchaser	(2,334		)	(2,431		)
Unamortized transaction costs	(368		)	(383		)
Net carrying value	$	35,481		$	35,042

Schedule of convertible debt interest expense

Total interest expense related to the Notes is as follows (in thousands):

	Three Months Ended March 31, 2018
Cash interest expense
Coupon interest expense	$	633
Non-cash interest expense
Amortization of debt discount - equity component	327
Amortization of debt discount - initial purchaser	97
Amortization of transaction costs	15
Total interest expense	$	1,072