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Stock Plans (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of our option activity

Schedule of our option activity
										Weighted
						Weighted				Average
						Average				Remaining				Aggregate
						Exercise				Option				Intrinsic
		Options (in				Price per				Term				Value
		thousands)				share				(in years)				(in thousands)
Outstanding at December 31, 2021			682			$	12.53				8.98			$	—
Granted			310				1.18
Forfeited or expired			(53	)			18.01
Outstanding at September 30, 2022			939			$	8.48				8.57			$	—
Exercisable at September 30, 2022			939			$	8.48				8.57			$	—

Schedule of the stock-based compensation expense

Schedule of the stock-based compensation expense
		Three Months Ended								Nine Months Ended
(in thousands)		September 30,								September 30,
		2022				2021				2022				2021
Research and development		$	306			$	325			$	553			$	659
Selling, general and administrative			217				330				414				691
Total stock-based compensation		$	523			$	655			$	967			$	1,350

Schedule of assumptions to estimate the fair value of options

Schedule of assumptions to estimate the fair value of options
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2022				2021				2022				2021
Weighted-average risk-free interest rate			—	%			—	%			1.91	%			0.5	%
Expected dividend payments			—				—				—				—
Expected holding period (years) 1			—				—				5.3				5.5
Weighted-average volatility factor 2			—				—				1.16				1.14
Estimated forfeiture rates for options granted 3			—	%			—	%			5.6	%			30	%

(1)	Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.
(2)	Weighted average volatility is based on the historical volatility of our common stock.
(3)	Estimated forfeiture rates are based on historical data.

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- References

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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- 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.

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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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