Stock Options (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity for Options and Restricted Stock Units (RSUs) Outstanding

The following table presents the activity for options and restricted stock units (RSUs) outstanding (in thousands, except for weighted average exercise price and weighted average grant date value per share):

	Stock Options			Weighted Average Exercise Price		RSUs		Weighted Average Grant Date Value Per Share
Outstanding ‑ December 31, 2019		1,916		$	1.73		26	$	0.78
Granted		829			2.67		53		0.78
Forfeited/canceled		(40	)		0.83		—		—
Exercised		(35	)		0.53		—		—
Outstanding ‑ September 30, 2020		2,670		$	2.05		79	$	0.78

Composition of Options Outstanding and Exercisable

The following table presents the composition of options outstanding and exercisable as of September 30, 2020 (in thousands, except price and life):

	Options Outstanding						Options Exercisable
					Life
Exercise Prices	Number		Price*		(years)*		Number		Price*
$0.42 - $0.83		1,922	$	0.65		7.9		711	$	0.65
$2.61 - $3.74		157		3.15		2.7		136		3.38
$4.39 - $4.45		113		4.39		4.0		113		4.39
$6.83		478		6.83		9.2		307		6.83
Total ‑ September 30, 2020		2,670	$	2.05		7.7		1,267	$	2.79

* Price and Life reflect the weighted average exercise price and weighted average remaining contractual life, respectively.

Summary of Weighted Average Assumptions

The fair value of each option grant is estimated on the date of grant using the Black‑Scholes option pricing model with the following weighted average assumptions for the nine months ended September 30, 2020 (dollars in thousands):

Approximate risk‑free rate		0.50	%
Average expected life		5.63
Dividend yield		—	%
Volatility		77	%
Estimated fair value of total options granted	$	362

Impact of Employee Stock-based Compensation Expense

The following table presents the impact of employee stock-based compensation expense on statements of income line items for the periods indicated (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Research and development	$	10	$	10	$	20	$	25
Sales, marketing, general and    administrative		90		35		135		100
Total stock-based compensation    expense	$	100	$	45	$	155	$	125