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Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Net Carrying Amount of Debt The 2025 Notes consist of the following (in thousands):
June 30,
2022		December 31,
2021
Principal$161,898 $161,898 
Add: fair value of embedded derivative 24 926 
Less: unamortized debt discount (2,346)(2,761)
Less: unamortized issuance costs(1,868)(2,197)
Net carrying amount$157,708 $157,866 
Schedule of Interest Expense 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,
2022202120222021
Contractual interest expense$1,315 $1,315 $2,631 $2,584 
Amortization of debt discount207 207 414 415 
Amortization of debt issuance costs165 165 330 330 
Total interest expense$1,687 $1,687 $3,375 $3,329