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Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

Activity under the Company's stock option plans is set forth below:

						Number of Options						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value
Outstanding, December 31, 2019						1,375,542						$	8.33					9.16						$	23,654
Granted						951,031						$	16.02
Exercised						(47,549)						$	0.27
Forfeited						(293,412)						$	10.46
Expired						(9,851)						$	29.02
Outstanding, December 31, 2020						1,975,761						$	11.81					8.71						$	6,750
Vested and expected to vest, December 31, 2020						1,975,761						$	11.81					8.71						$	6,750
Options exercisable, December 31, 2020						464,606						$	6.75					8.01						$	3,362

Schedule of Fair Value Assumptions, Stock Options

The fair value of employee stock options was estimated using the following assumptions to determine the fair value of stock options granted:

												Years Ended December 31,
																		2020						2019
Expected volatility																		47%-53%						46%-59%
Risk-free interest rate																		0.4%-1.7%						1.6%-2.6%
Dividend yield																		—						—
Expected term (in years)																		5.50-6.08						5.75-6.08

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

												Years Ended December 31,
																		2020
Expected volatility																		58%-83%
Risk-free interest rate																		0.1%-1.1%
Dividend yield																		—
Expected term (in years)																		0.5

Schedule of Non-cash Stock-based Compensation Expense

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

												Years Ended December 31,
																		2020						2019
Cost of revenue																		$	33					$	9
Selling, general and administrative																		2,419						445
Research and development																		242						118
Total																		$	2,694					$	572

Schedule of Common Stock Reserved For Future Issuance

Common stock reserved for future issuance consists of the following at December 31, 2020:

Warrants to purchase common stock						426,827
Common stock option grants issued and outstanding						1,975,761
Common shares available for grant under the stock option plan						1,139,323
Common shares available for future issuance under ESPP						233,961
Total						3,775,872

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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 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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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