Convertible Notes and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following table presents the components of the Notes as of December 31, 2015 (in thousands, except for years and percentages):

Liability:
Principal amount	$	128,250
Less: Debt discount, net of amortization	(26,732		)
Less: Debt issuance costs, net of amortization	(3,223		)
Carrying amount	$	98,295
Remaining amortization period (years)	4.9 years
Effective interest rate on liability component	9.94		%
Equity:
Value of conversion option	$	26,925
Less: Equity issuance costs	(863		)
Carrying amount	$	26,062

Convertible Interest Expense Recognized

The following table presents interest expense recognized related to the Notes for the year ended December 31, 2015 (in thousands):

Contractual interest expense	$	240
Amortization of debt discount	193
Amortization of debt issuance costs	23
Total interest expense recognized	$	456