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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Stock-Based Compensation

Schedule of stock option activity under the Company's Equity Incentive Plans

				Weighted
				Average			Weighted		Aggregate
				Exercise Price			Average Remaining		Intrinsic
		Options		Per Share			Life in Years		Value
Outstanding at December 31, 2018		2,761,912		$	11.30		8.01		$	—
Granted		1,481,975		$	1.48
Forfeited		(219,321)		$	15.14
Outstanding at December 31, 2019		4,024,566		$	7.48		7.98		$	2
Granted		2,662,500		$	2.10
Exercised		(32,778)		$	1.53
Forfeited		(260,435)		$	6.95
Outstanding at December 31, 2020		6,393,853		$	5.29		7.96		$	1,961
Options exercisable at December 31, 2020		3,482,169		$	7.83		7.07		$	722
Options vested and expected to vest at December 31, 2020		6,393,853		$	5.29		7.96		$	1,961

Schedule of assumptions used to determine grant-date fair value of stock options

		Year Ended December 31,
		2020		2019
Expected volatility		66.94	%	66.94	%
Weighted average risk-free interest rate		0.66	%	2.07	%
Expected dividend yield		0.00	%	0.00	%
Expected term (in years)		6.85		6.77

Schedule of stock-based compensation expense related to issuance of stock option awards recognized in condensed consolidated statements of operations

		Year Ended
		December 31,
		2020			2019
Research and development		$	1,028		$	714
General and administrative			1,296			3,018
Total		$	2,324		$	3,732

Summary of outstanding RSU's under the 2016 Plan

				Weighted
		Number of		Average
		Shares		Fair Value
Outstanding at December 31, 2018		—		$	—
Awarded		181,000		$	1.74
Settled in cash		(90,500)		$	1.17
Outstanding at December 31, 2019		90,500		$	1.76
Awarded		753,106		$	1.49
Settled in cash		(90,500)		$	1.76
Outstanding at December 31, 2020		753,106		$	1.52

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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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