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Interest Expense and Other
6 Months Ended
Jun. 30, 2022
Other Income and Expenses [Abstract]  
Interest Expense and Other INTEREST EXPENSE AND OTHER
Interest expense and other for the three months ended June 30, 2022 and 2021 consisted of the following (in thousands):

Three months ended June 30,Six months ended June 30,
2022202120222021
Interest on term loan debt$— $269 $— $395 
Interest on PPP loan— — 11 
Interest on convertible note— 288 — 566 
Amortization of debt issuance costs— 426 — 437 
Amortization of debt discount— 276 — 543 
Amortization of premiums on marketable securities, net of accretion of discounts272 — 608 — 
Common stock purchase agreement costs28 — 28 — 
Other— 14 — 
Interest expense and other$307 $1,264 $650 $1,952