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Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2019

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, 2018						661,180						$	1.22					9.52						$	6,198
Granted						816,356						$	13.99
Exercised						(1,548)						$	2.41
Forfeited						(99,967)						$	7.50
Expired						(479)						$	42.08
Outstanding, December 31, 2019						1,375,542						$	8.33					9.16						$	23,654
Vested and expected to vest, December 31, 2019						1,375,542						$	8.33					9.16						$	23,654
Options exercisable, December 31, 2019						203,344						$	3.49					7.85						$	4,625

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,
																		2019						2018
Expected volatility																		46%-59%						70%
Risk-free interest rate																		1.6%-2.6%						1.4% - 2.6%
Dividend yield																		—						—
Expected term (in years)																		5.75-6.08						6.08

Schedule of Non-cash Stock-based Compensation Expense

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

																		Years Ended December 31,
																		2019						2018
Cost of revenue																		$	9					$	12
Selling, general and administrative																		445						93
Research and development																		118						9
Total																		$	572					$	114

Schedule of Common Stock Reserved For Future Issuance

Common stock reserved for future issuance consists of the following at December 31, 2019:

Warrants to purchase common stock						461,273
Common stock option grants issued and outstanding						1,375,542
Common shares available for grant under the stock option plan						1,283,996
Common shares available for future issuance under ESPP						120,000
Total						3,240,811

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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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