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CONVERTIBLE NOTES PAYABLE CONVERTIBLE NOTES PAYABLE (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The composition of the Company’s 2025 Notes are as follows (in thousands):
 June 30, 2020 December 31, 2019
2.50% convertible senior notes due 2025$276,000  $276,000  
Unamortized debt discount(61,265) (65,963) 
Unamortized debt issuance costs(4,726) (5,176) 
Total 2025 Notes, net of unamortized debt discount and debt issuance costs$210,009  $204,861  
The effective interest rate on the liability components of the 2025 Notes for the period from the date of issuance through June 30, 2020 was 7.7%. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Contractual interest expense$1,725  $1,725  $3,450  $3,450  
Amortization of debt discount2,371  2,197  4,698  4,352  
Amortization of debt issuance costs225  224  449  448  
Total interest expense for the 2025 Notes$4,321  $4,146  $8,597  $8,250