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Equity-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Equity-based Compensation

Schedule of total equity-based compensation expense

​

​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	Three Months Ended September 30,					​	Nine Months Ended September 30,
​		2021			2020			2021			2020
Research and development	​	$	(4)	​	$	56	​	$	30	​	$	161
General and administrative	​		76	​		73	​		234	​		181
Total equity-based compensation	​	$	72	​	$	129	​	$	264	​	$	342

Schedule of fair value of options granted using the Black-Scholes option pricing model

​

​	​	​	​	​
​	​	Nine Months Ended September 30,
​		2021		2020
Fair value of common stock	​	$1.75 - $6.15		$1.20
Expected volatility	​	100.82% - 101.83%		104.60% - 109.34%
Risk-free interest rate	​	0.67% - 1.06%		0.38% - 1.60%
Dividend yield	​	0.00%		0.00%
Expected term (years)	​	5.00 - 6.22		5.00 - 6.25

Summary of activity for options

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Options Outstanding
​	​	​	​	​	​	​	​	​	​	Weighted
​	​	​	​	Weighted-		​	Aggregate		​	Average
​	​	​	​	Average		​	Intrinsic		​	Remaining
​	​	Number of	​	Exercise		​	Value		​	Contractual Life
​		Options		Price			(in 000’s)			(In Years)
Balance, December 31, 2020		4,587,865	​	$	0.98		​
Options granted		67,232	​	$	2.25		​
Options exercised		(25,783)	​	$	0.73		​
Options forfeited		(161,479)	​	$	1.12		​
Options expired		(148,843)	​	$	0.94		​
Balance, September 30, 2021		4,318,992	​	$	1.00	​	$	22,213		6.4
Exercisable as of September 30, 2021		3,023,934	​	$	0.92	​	$	15,800		5.6
Vested and expected to vest as of September 30, 2021		3,982,080	​	$	1.00	​	$	20,494		6.3

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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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