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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2021
Convertible Senior Notes  
Schedule of components of notes payable

Convertible Senior Notes payable consisted of the following at December 31, 2021 and 2020 (in thousands):

December 31, 

    

2021

    

2020

Principal amount of 2025 Senior Notes

$

14,344

$

115,000

Principal amount of 2026 Senior Notes

 

402,500

 

Less: unamortized debt issuance costs

(12,673)

(3,656)

Net carrying value of Convertible Senior Notes payable

$

404,171

$

111,344

Schedule of interest expenses incurred in connection with the Senior Notes

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

December 31,

    

2021

    

2020

    

2019

Coupon interest

$

1,005

$

2,108

$

Amortization of debt issuance costs

3,419

437

 

Total interest expense on Convertible Senior Notes

$

4,424

$

2,545

$