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CONVERTIBLE NOTES PAYABLE (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The composition of the Company’s 2025 Notes are as follows (in thousands):
 September 30, 2020 December 31, 2019
2.50% convertible senior notes due 2025
$276,000 $276,000 
Unamortized debt discount(58,848)(65,963)
Unamortized debt issuance costs(4,501)(5,176)
Total 2025 Notes, net of unamortized debt discount and debt issuance costs$212,651 $204,861 
The effective interest rate on the liability components of the 2025 Notes for the period from the date of issuance through September 30, 2020 was 7.7%. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Contractual interest expense$1,725 $1,725 $5,175 $5,175 
Amortization of debt discount2,417 2,239 7,115 6,591 
Amortization of debt issuance costs225 224 674 672 
Total interest expense for the 2025 Notes$4,367 $4,188 $12,964 $12,438