Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Summary of Debt Obligations

The following table sets forth our various debt obligations:

	December 31,
	2021		2020
2021 Promissory Note	$	5,220	$	—
Series A Note (principal amount)	—		2,481
Series B Note (principal amount)	—		3,585
Paycheck Protection Program Loan	—		2,850
Convertible Notes	—		250
Promissory Notes	—		905
Total debt	$	5,220	$	10,071
Debt discount - warrants (2021 Promissory Note)	(316)		—
Debt discount - warrants (2020 Convertible Notes)	—		(1,029)
Debt discount - issuance costs (2020 Convertible Notes)	—		(650)
Less: current maturities of long-term debt	(4,904)		(4,435)
Less: long-term related-party debt	—		(195)
Long-term debt	$	—	$	3,762

Summary of Calculated Aggregate Fair Values and Assumptions

The following table sets forth the assumptions used and calculated aggregated fair values of the liability classified warrants:

	December 31, 2021			December 31, 2020
Strike price per share	$	2.25		$	4.00
Closing price per share	$	2.63		$	1.26
Term (years)	1.53			2.53
Volatility	186		%	146		%
Risk-free rate	0.56		%	0.17		%
Dividend Yield	—			—

Summary of Change in Fair Value of Warrant Liability

A summary of the change in fair value of the warrant liability is set forth below:

	2021		2020
Balance, beginning of period	$	1,614	$	—
Warrant issued	—		2,486
Warrant Exercised	(16,148)		—
Change in fair value of warrant liability	18,139		(872)
Balance, end of period	$	3,605	$	1,614

Summary of Interest Expense

The following table sets forth interest expense for our various debt obligations included in the consolidated statements of operations and comprehensive loss:

	Year Ended December 31,
	2021		2020
2020 Convertible Notes	$	1,111	$	722
Accretion of debt discount - issuance costs	1,913		686
Accretion of debt discount - warrants	1,029		1,457
2021 Promissory Note	203		—
Senior Convertible Note	—		197
Factoring financing agreement	75		175
All other debt and financing obligations	150		176
Total	$	4,481	$	3,413