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Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

Stock option activity under the Company's 2019 Plan is set forth below:

						Number of Options						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value
Outstanding, December 31, 2021						2,014,330						$	12.10					7.87						$	5,428
Granted						63,000						$	5.25
Exercised						(245,186)						$	0.26
Forfeited						(257,982)						$	16.09
Expired						(152,927)						$	13.73
Outstanding, December 31, 2022						1,421,235						$	12.94					7.09						$	483
Vested and expected to vest, December 31, 2022						1,421,235						$	12.94					7.09						$	483
Options exercisable, December 31, 2022						1,129,333						$	12.94					6.89						$	483

Schedule of Share-based Payment Arrangement, Restricted Stock Unit, Activity

Restricted stock unit activity under the Company's 2019 Plan is set forth below:

						Number of Shares						Weighted- Average Grant Date Fair Value						Aggregate Intrinsic Value
Outstanding, December 31, 2021						415,325						$	16.54					$	4,830
Awards granted						1,076,725						$	5.89
Awards released						(100,586)						$	16.55
Awards canceled						(355,256)						$	11.29
Outstanding, December 31, 2022						1,036,208						$	7.28					$	2,487

Schedule of Fair Value Assumptions, Stock Options

The fair value of employee stock options was estimated using the following assumptions in the Black-Scholes options pricing model to determine the fair value of stock options granted:

						Year Ended December 31,
						2022						2021
Expected volatility						54%						56%-60%
Risk-free interest rate						3.4%						0.8%-1.1%
Dividend yield						—						—
Expected term (in years)						5.5						5.5-6.1

The following assumptions were used to calculate the stock-based compensation for each stock purchase right granted under the ESPP:

						Year Ended December 31,
						2022						2021
Expected volatility						45%-57%						45%-60%
Risk-free interest rate						0.6%-3.3%						0.1%
Dividend yield						—						—
Expected term (in years)						0.5						0.5

Schedule of Non-cash Stock-based Compensation Expense

Total non-cash stock-based compensation expense recorded related to options granted, restricted stock units granted and stock purchase rights granted under the ESPP in the statement of operations is as follows (in thousands):

 

						Year Ended December 31,
						2022						2021
Cost of revenue						$	213					$	164
Selling, general and administrative						3,860						3,943
Research and development						631						621
Total						$	4,704					$	4,728

Schedule of Common Stock Reserved For Future Issuance

Common stock reserved for future issuance consists of the following at December 31, 2022:

Warrants to purchase common stock						1,214,059
Common stock option grants issued and outstanding						1,421,235
Common stock reserved for issuance upon vesting of outstanding restricted stock units						1,036,370
Common shares available for grant under the 2019 Plan						1,452,435
Common shares available for future issuance under ESPP						413,425
Total						5,537,524

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Tabular disclosure of share-based payment arrangement.

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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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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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