CONVERTIBLE NOTES PAYABLE CONVERTIBLE NOTES PAYABLE (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The effective interest rate on the liability components of the 2025 Notes for the period from the date of issuance through September 30, 2018 was 7.7%. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):

	Three and Nine months ended September 30,
	2018		2017
Contractual interest expense	383		—
Amortization of debt issuance costs	468		—
Amortization of debt discount	50		—
Total interest expense for the 2025 Notes	$	901	$	—

The composition of the Company’s 2025 Notes are as follows (in thousands):

	September 30, 2018			December 31, 2017
2.50% convertible senior notes due 2025	$	276,000		$	—
Unamortized debt discount	(76,951		)	—
Unamortized debt issuance costs	(6,296		)	—
Total 2025 Notes, net of unamortized debt discount and debt issuance costs	$	192,753		$	—

The composition of the Company’s 2019 Notes are as follows (in thousands):

	September 30, 2018			December 31, 2017
4.50% senior convertible notes due 2019	$	22,590		$	46,000
Unamortized debt discount	(200		)	(867		)
Unamortized debt issuance costs	(13		)	(56		)
Total 2019 Notes, net of unamortized debt discount and debt issuance costs	$	22,377		$	45,077