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NOTES PAYABLE (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of fair value of warrants
The composition of the Company’s 2025 Notes are as follows (in thousands):
 
December 31, 2018
 
December 31, 2017
2.50% convertible senior notes due 2025
$
276,000

 
$
—

Unamortized debt discount
(74,836
)
 
—

Unamortized debt issuance costs
(6,073
)
 
—

Total 2025 Notes, net of unamortized debt discount and debt issuance costs
$
195,091

 
$
—

The effective interest rate on the liability components of the 2025 Notes for the period from the date of issuance through December 31, 2018 was 7.7%. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
 
Twelve Months Ended December 31,
 
2018
 
2017
Contractual interest expense
$
2,108

 
$
—

Amortization of debt discount
2,582

 
—

Amortization of debt issuance costs
273

 
—

Total interest expense for the 2025 Notes
$
4,963

 
$
—
Schedule of net carrying amount of debt
The net carrying amount of the Notes consists of the following (in thousands):
 
December 31,
 
2018
 
2017
Aggregate principle amount of Notes
$
22,590

 
$
46,000

Unamortized debt discount and debt issuance costs
(133
)
 
(923
)
 
$
22,457

 
$
45,077