Stockholders' Equity And Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Stockholders' Equity [Line Items]

Schedule Of Stock-Based Compensation Expense

	Three-Month Periods Ended				Nine-Month Periods Ended
	September 30,				September 30,
	2022		2021		2022		2021
Cost of revenues	$	24	$	37	$	204	$	37
Research and development		287		418		1,240		4,586
Sales and marketing		(44)		65		772		2,326
General and administrative		456		1,057		2,227		4,041
Total stock-based compensation expense	$	723	$	1,577	$	4,443	$	10,990

Summary Of Stock-Based Compensation Expense By Type

	Three-Month Periods Ended				Nine-Month Periods Ended
	September 30,				September 30,
	2022		2021		2022		2021
Time-based options	$	562	$	2,072	$	3,814	$	5,758
Performance options		18		(625)		233		4,903
ESPP		143		130		396		329
Total stock-based compensation expense	$	723	$	1,577	$	4,443	$	10,990

Options [Member]

Stockholders' Equity [Line Items]

Summary Of Stock Option Activity

	Stock Options Outstanding
			Weighted
	Number		average
	of shares		exercise price
Balances — December 31, 2021	5,996,813	$	15.77
Options granted	1,440,100
Options exercised	-
Options canceled	(1,310,558)
Options expired	(418,867)
Balances — September 30, 2022	5,707,488	$	12.97
Exercisable — September 30, 2022	3,573,084	$	15.61

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended September 30,		Nine-Month Periods Ended September 30,
	2022	2021	2022	2021
Expected term (in years)	6.3	6.1	5.3 - 6.8	5.3 - 6.1
Expected volatility	88%	78%	83 - 88%	78%
Risk-free interest rate	3.2%	0.9%	1.9 - 3.2%	0.9 - 1.1%
Dividend yield	0%	0%	0%	0%

Time-Based Options [Member]

Stockholders' Equity [Line Items]

Summary Of Stock Option Activity

	Stock Options Outstanding
			Weighted
	Number		average
	of shares		exercise price
Balances — December 31, 2021	4,796,716	$	16.44
Options granted	1,240,100
Options exercised	-
Options canceled	(564,558)
Options expired	(351,992)
Balances — September 30, 2022	5,120,266	$	13.26
Exercisable — September 30, 2022	3,317,412	$	15.90

Performance Options [Member]

Stockholders' Equity [Line Items]

Summary Of Stock Option Activity

	Stock Options Outstanding
			Weighted
	Number		average
	of shares		exercise price
Balances — December 31, 2021	1,200,097	$	13.11
Options granted	200,000
Options exercised	-
Options canceled	(746,000)
Options expired	(66,875)
Balances — September 30, 2022	587,222	$	10.44
Exercisable — September 30, 2022	255,672	$	11.88

2017 Employee Stock Purchase Plan [Member]

Stockholders' Equity [Line Items]

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended September 30,		Nine-Month Periods Ended September 30,
	2022	2021	2022	2021
Expected term (in years)	0.5 - 1.0	0.5 - 1.0	0.5 - 1.0	0.5 - 1.0
Expected volatility	83%	78%	83%	78%
Risk-free interest rate	3.3 - 3.5%	0.06 - 0.07%	0.6 - 3.5%	0.06 - 0.1%
Dividend yield	0%	0%	0%	0%