Promissory Notes (Tables)

12 Months Ended

Dec. 31, 2021

Notes Payable, Current [Abstract]

Schedule of of outstanding convertible notes

The following is the summary of outstanding promissory notes as of December 31, 2021 and 2020 (in thousands):

		December 31, 2021				December 31, 2020
	Interest rate	Principal Amount		Carrying Amount*		Principal Amount		Carrying Amount*
Convertible Debenture (a)	4.0%	$	57,500	$	57,809	$	—	$	—
Vendor Note Payable (b)	0.25%-4%	—		—		105		105
Small Business Association Paycheck Protection Program (c)	1.0%	311		312		460		463
Total		$	57,811	58,121		$	565	568
Less: Current portion				(58,121)				(568)
Long-term Note, less current portion				$	—			$	—

Ties to

*Carrying amount includes the accrued interest and approximates the fair value because of the short-term nature of these instruments.

During the year ended December 31, 2021, the Company issued several convertible debt instruments to YA II PN, the terms of which are summarized in the following table (principal and gross proceeds in thousands):

	YA II PN Note 1			YA II PN Note 2			YA II PN Note 3			YA II PN Note 4
Principal	$	37,500		$	37,500		$	65,000		$	80,000
Gross proceeds	$	37,500		$	37,500		$	65,000		$	80,000
Interest rate	4.0		%	4.0		%	4.0		%	4.0		%
Conversion price	$	2.00		$	3.31		$	4.12		$	4.95
Maturity dates	July 4, 2021			July 15, 2021			July 28, 2021			August 8, 2021

Schedule of impact to the consolidated statements of operations associated with promissory notes

The following table summarizes the impact to the consolidated statements of operations associated with outstanding promissory notes (in thousands):

	Year Ended
	December 31 2021		December 31 2020		December 31 2019
Interest expense excluding amortization of debt discount	$	2,139	$	1,593	$	1,449
Interest expense related to amortization of debt discount	—		14,485		4,235
Total interest expense	$	2,139	$	16,078	$	5,684
Expense due to conversion of notes	$	—	$	2,266	$	—
(Gain)loss on extinguishment of debt	$	(300)	$	(8,891)	$	3,940