Stock-Based Compensation

6 Months Ended

Jun. 30, 2022

Stock-Based Compensation

Stock-Based Compensation

(8) Stock-Based Compensation

The Company has two equity incentive plans: the 2012 Stock Incentive Plan and the Amended and Restated 2019 Equity Incentive Plan. New awards can only be granted under the Amended and Restated 2019 Equity Incentive Plan (the “Plan”). At June 30, 2022, 983,654 shares of common stock were available for future issuances under the Plan. The Plan is subject to an annual increase, subject to prior approval by the Company’s board of directors, equal to the lesser of (i) 432,442 shares, (ii) 4% of the shares outstanding on the last day of the immediately preceding fiscal year and (iii) such smaller number of shares as determined by the board of directors. The Plan provides for the grant of incentive stock options, nonqualified stock options, restricted stock awards, restricted stock units and/or stock appreciation rights to employees, directors, and other persons, as determined by the Company’s board of directors. The Company estimates forfeitures that it expects will occur and adjusts expense for actual forfeitures in the periods they occur.

The Company measures employee and nonemployee stock-based awards at grant-date fair value and records compensation expense ratably over the vesting period of the award. The Company recorded stock-based compensation expense in the following expense categories of the accompanying consolidated statements of operations and comprehensive loss (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2022		2021		2022		2021
Sales and marketing	$	340	$	253	$	647	$	437
General and administrative		535		385		999		751
Research and development		147		774		277		918
Total stock‑based compensation	$	1,022	$	1,412	$	1,923	$	2,106

Stock Options

The Company’s stock options vest based on the terms in each award agreement and generally vest over four years and have a term of 10 years. The following table summarizes stock option activity:

				Weighted
				average
		Weighted		remaining
	Number of	average exercise		contractual term
	shares	price per share		(years)
Outstanding at January 1, 2022	1,706,409	$	11.88
Granted	322,285		10.88
Exercised	(1,964)		6.09
Canceled/forfeited	(67,293)		13.49
Outstanding at June 30, 2022	1,959,437	$	11.67	7.50
Vested and expected to vest at June 30, 2022	1,901,058	$	11.64	7.45
Exercisable at June 30, 2022	1,064,134	$	10.74	6.41

Included in outstanding options at June 30, 2022, were 257,750 stock options granted outside of the Plan. These grants were made pursuant to the Nasdaq inducement grant exception in accordance with Nasdaq listing rule 5635(c)(4). At June 30, 2022, the aggregate intrinsic value of both outstanding options and exercisable options was $0.5 million.

The 2012 Stock Incentive Plan provided the holders of stock options an election to early exercise prior to vesting. The Company had the right, but not the obligation, to repurchase early exercised options without transferring any appreciation to the employee if the employee terminates employment before the end of the original vesting period. The repurchase price was the lesser of the original exercise price or the then fair value of the common stock.

The following table summarizes activity relating to early exercise of stock options:

	Number of
	shares
Unvested balance at January 1, 2022	29
Vested	(29)
Unvested balance at June 30, 2022	—

The weighted average grant-date fair value per share of options granted was $6.84 during the six months ended June 30, 2022. The aggregate intrinsic value of options exercised was $3,000 and $10,000 for the three and six months ended June 30, 2022, respectively. At June 30, 2022, the total unrecognized compensation expense related to unvested employee and nonemployee stock option awards was $5.8 million, which is expected to be recognized in expense over a weighted-average period of approximately 2.6 years.

Estimating Fair Value of Stock Options

The fair value of each grant of stock options was determined by the Company using the methods and assumptions discussed below. Certain of these inputs are subjective and generally require judgment to determine.

Expected term – The expected term of stock options represents the weighted-average period the stock options are expected to be outstanding. The Company uses the simplified method for estimating the expected term as provided by the Securities and Exchange Commission. The simplified method calculates the expected term as the average time to vesting and the contractual life of the options.

Expected volatility – Due to the Company’s limited operating history and lack of sufficient company-specific historical or implied volatility, the expected volatility assumption was determined by examining the historical volatilities of a group of industry peers, including the Company, whose share prices are publicly available.

Risk-free interest rate – The risk-free rate assumption is based on U.S. Treasury instruments, the terms of which were consistent with the expected term of the Company’s stock options.

Expected dividend – The Company has not paid and does not intend to pay dividends.

The fair value of each option was estimated on the date of grant using the Black-Scholes option pricing model and the weighted average assumptions in the table below:

	Six months ended
	June 30, 2022
Expected dividend yield	—
Expected volatility	68.4	%
Risk‑free interest rate	2.17	%
Expected term (in years)	6.18

Restricted Stock Units

The Company’s restricted stock units (“RSUs”) vest based on the terms in each award agreement and generally vest over four years. The following table summarizes restricted stock units for the Plan:

	Number of
	shares
Outstanding at January 1, 2022	163,043
Granted	190,450
Vested	(38,908)
Canceled/forfeited	(4,818)
Outstanding at June 30, 2022	309,767

The weighted average grant-date fair value per RSU granted was $11.30 during the six months ended June 30, 2022. The aggregate intrinsic value of RSUs outstanding was $2.2 million at June 30, 2022. The total unrecognized compensation expense at June 30, 2022 related to RSUs was $3.1 million, which is expected to be recognized in expense over a weighted-average period of approximately 3.1 years.