Stockholders' Equity And Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Stockholders' Equity [Line Items]

Summary Of Stock Option Activity

	Stock Options Outstanding
			Weighted
	Number		average
	of shares		exercise price
Balances — December 31, 2020	5,039,194	$	14.26
Options granted	976,078
Options exercised	(44,981)
Options canceled	(80,029)
Options expired	(62,738)
Balances — June 30, 2021	5,827,524	$	15.64
Exercisable — June 30, 2021	3,042,982	$	16.00

Summary Of Stock-Based Compensation Expense

	Three-Month Periods Ended				Six-Month Periods Ended
	June 30,				June 30,
	2021		2020		2021		2020
Research and development	$	1,002	$	897	$	4,168	$	1,774
Sales and marketing		500		280		2,261		590
General and administrative		946		1,235		2,984		2,674
Total stock-based compensation expense	$	2,448	$	2,412	$	9,413	$	5,038

Employee Stock Option [Member]

Stockholders' Equity [Line Items]

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended June 30,		Six-Month Periods Ended June 30,
	2021	2020	2021	2020
Expected term in years	5.3 - 6.1	5.3 - 6.1	5.3 - 6.1	5.3 - 6.1
Expected volatility	78%	70%	78%	70%
Risk-free interest rate	0.9 - 1.0%	0.4 - 0.5%	0.9 - 1.1%	0.4 - 0.5%
Dividend yield	—	—	—	—

2017 Employee Stock Purchase Plan [Member]

Stockholders' Equity [Line Items]

Schedule Of Fair Value Of Employee Stock Options

	Three-Month Periods Ended June 30,		Six-Month Periods Ended June 30,
	2021	2020	2021	2020
Expected term in years	0.5 - 1.0	0.5 - 1.0	0.5 - 1.0	0.5 - 1.0
Expected volatility	78%	70%	78%	70%
Risk-free interest rate	0.07 - 0.08%	0.9 - 1.0%	0.07 - 0.1%	0.9 - 1.0%
Dividend yield	—	—	—	—