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Shareholders' Deficit (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Schedule of Outstanding Stock Options

Total outstanding stock options as of June 30, 2020 and 2019 were as follows:

		2020								2019
		Number of shares				Weighted average exercise price				Number of shares				Weighted average exercise price
Outstanding at beginning of period			3,505,119			$	2.07				907,315			$	1.66
Granted			869,075			$	16.35				1,013,635			$	2.06
Exercised			(266,687	)		$	1.83				—				—
Cancelled or forfeited			(7,962	)		$	2.13				—				—
Outstanding at end of period			4,099,545			$	5.11				1,920,950			$	1.87

Schedule of Share-based Compensation Expense

Share-based compensation expense was allocated as follows:

		Three Months Ended June 30,								Six Months Ended June 30,
		2020				2019				2020				2019
Research and development		$	163			$	63			$	296			$	103
General and administrative			226				58				364				83
Total share-based compensation expense		$	389			$	121			$	660			$	186

Schedule of Fair Value of Stock Options Determined on Grant Date Using Black Scholes Option-Pricing Model

The assumptions that the Company used in the Black Scholes option-pricing model to determine the grant date fair value of stock options granted to employees and non-employees were as follows, presented on a weighted average basis:

		Three Months Ended June 30,								Six Months Ended June 30,
		2020				2019				2020				2019
Fair value of stock options		$	10.30				—			$	10.30			$	0.97
Exercise price		$	16.35				—			$	16.35			$	2.06
Share price		$	16.35				—			$	16.35			$	2.06
Risk-free interest rate			0.43	%			—				0.43	%			2.27	%
Expected terms (in years)			6.07				—				6.07				6.08
Expected volatility			71.99	%			—				71.99	%			70.79	%
Expected dividend yield			0.00	%			—				0.00	%			0.00	%

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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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