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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt
The Term Loan consists of the following (in thousands):
December 31,
2019
Principal$47,500  
Less: unamortized debt discount and issuance costs(962) 
Net carrying amount$46,538  
The 2025 Notes consist of the following (in thousands):
June 30,
2020
Liability component
Principal$180,375  
Add: fair value of embedded derivative 3,756  
Less: unamortized debt discount (4,458) 
Less: unamortized issuance costs(3,502) 
Net carrying amount$176,171  
The 2022 Notes consist of the following (in thousands):
June 30,
2020		December 31,
2019
Liability component
Principal$2  $105,125  
Less: unamortized debt discount and issuance costs—  (3,791) 
Net carrying amount$2  $101,334  
Schedule of Interest Expense The following table sets forth total interest expense recognized related to the Term Loan (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Contractual interest expense$516  $1,210  $1,667  $2,390  
Amortization of debt discount526  333  859  666  
Amortization of debt issuance costs63  40  103  80  
Total interest expense$1,105  $1,583  $2,629  $3,136  
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
Three Months Ended
June 30, 2020		Six Months Ended June 30, 2020
Contractual interest expense$800  $800  
Amortization of debt discount124  124  
Amortization of debt issuance costs96  96  
Total interest expense$1,020  $1,020  
The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Contractual interest expense$286  $1,445  $768  $2,891  
Amortization of debt discount700  1,955  1,952  3,911  
Amortization of debt issuance costs39  115  111  229  
Total interest expense$1,025  $3,515  $2,831  $7,031