Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of convertible debt

The following table summarizes the carrying value of the long-term convertible debt (in thousands):

	March 31, 2020		December 31, 2019
2025 Notes
Carrying value	$	109,393	$	107,169
Unamortized debt discount and issuance costs allocated to debt	63,107		65,331
Principal amount	$	172,500	$	172,500
Remaining amortization period (years)	5.5		5.8
2021 Notes
Carrying value	$	123,467	$	123,237
Unamortized issuance costs	1,533		1,763
Principal amount	$	125,000	$	125,000
Remaining amortization period (years)	1.7		1.9