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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation

Schedule of options granted under employee stock plans

		Shares Available for Grant				Number of Shares Outstanding				Weighted-Average Exercise Price
Balance as of December 31, 2018			149				2,889			$	1.80
Authorized			855				-				-
Granted			(1,116	)			1,116				0.78
Forfeited/expired			259				(259	)			3.53
Balance as of December 31, 2019			147				3,746			$	1.38
Authorized			2,342				-				-
Granted			(2,320	)			2,320				0.69
Exercised			-				(528	)			0.96
Forfeited/expired			211				(211	)			0.89
Balance as of December 31, 2020			380				5,327			$	1.14
Authorized			816				-				-
Options Granted			(1,141	)			1,141				5.60
RSAs Granted			(154	)							-
Exercised			-				(2,498	)			1.39
Forfeited/expired			241				(207	)			1.84
Balance as of December 31, 2021			289				7,509			$	2.29

Vested and unvested awards outstanding

		Number of Shares				Weighted Average Exercise Price				Remaining Contractual Term (In Years)				Aggregate Intrinsic Value1
2021
Vested and Exercisable			2,346			$	1.32				7.68			$	25,771
Unvested			1,417				3.89				8.64				12,961
Total			3,763			$	2.29				8.04			$	38,732
2020
Vested and Exercisable			3,718			$	1.30				7.42			$	4,592
Unvested			1,609				0.77				8.82				2,771
Total			5,327			$	-				7.84			$	7,363
2019
Vested and Exercisable			2,659			$	1.56				7.45			$	145
Unvested			1,087				0.93				8.78				77
Total			3,746			$	1.38				7.84			$	222

Schedule of weighted average fair value calculations for options granted

Description		For the year ended December 31,
		2021				2020				2019
Dividend-yield			0	%			0	%			0	%
Risk-free interest rate			0.83	%			0.94	%			2.38	%
Expected volatility			100.47	%			87.37	%			88.54	%
Expected life (years)			6.59				6.55				6.55
Market value per share on grant date		$	5.60			$	0.69			$	0.78
Fair value per share on grant date		$	4.68			$	0.51			$	0.59

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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