Convertible Notes Payable - Related Party - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Amortization of debt discount		$ 1,548	$ 0
Amortization of debt issuance costs		204	$ 0
Yorkville Convertible Note
Debt Instrument [Line Items]
Contractual interest expense	$ 0	0
Amortization of debt discount	81	81
Amortization of debt issuance costs	27	27
Total	108	108
2021 Convertible Notes without embedded derivative liability
Debt Instrument [Line Items]
Contractual interest expense	1,544	3,087
Amortization of debt discount	924	1,467
Amortization of debt issuance costs	90	177
Total	$ 2,558	$ 4,731

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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