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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2022
Convertible Senior Notes  
Schedule of convertible senior notes payable

Convertible Senior Notes payable consisted of the following at December 31, 2022 and 2021 (in thousands):

December 31, 

    

2022

    

2021

Principal amount of 2025 Convertible Senior Notes

$

14,344

$

14,344

Principal amount of 2026 Convertible Senior Notes

 

402,500

 

402,500

Less: unamortized debt issuance costs

(10,136)

(12,673)

Net carrying value of Convertible Senior Notes payable

$

406,708

$

404,171

Schedule of interest expenses incurred in connection with the convertible senior notes

Interest expense incurred in connection with the Convertible Senior Notes consisted of the following for the years ended December 31, 2022, 2021 and 2020 (in thousands):

December 31,

    

2022

    

2021

    

2020

Coupon interest

$

3,496

$

1,005

$

2,108

Amortization of debt issuance costs

2,537

3,419

 

437

Total interest expense on Convertible Senior Notes

$

6,033

$

4,424

$

2,545