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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation [Abstract]

Schedule of Stock Based Compensation Expense

Stock based compensation has been reported within expense line items on the consolidated statement of operations for the years ended 2018 and 2019 as shown in the following table (in thousands):

		Year Ended
		December 31,
		2018			2019
General and administrative		$	88			166
Research and development			243			300
Stock-based compensation costs before income taxes		$	331			466

Schedule of Share Option Activity

A summary of the share option activity and related information is as follows:

							Weighted
				Weighted			Average
		Number of		Average			Remaining		Aggregate
		Options		Exercise			Contractual		Intrinsic
		Outstanding		Price Per Share			Term (Years)		Value ($000)
Options outstanding at December 31, 2017		535,617		$	11.10		8.23		$	—
Granted		306,304		$	1.51
Exercised		—
Cancelled/forfeited		(10,310)		$	82.38
Options outstanding at December 31, 2018		831,611		$	6.68		8.13		$	—
Granted		1,550,270		$	0.71
Exercised		—
Cancelled/forfeited		(376,319)		$	3.23
Options outstanding at December 31, 2019		2,005,562		$	2.72		—		$	—
Unvested at December 31, 2019		1,154,273		$	0.74		9.06		$	—
Vested and exercisable at December 31, 2019		851,289		$	5.40		8.02		$	4

Schedule of Fair Value of the Stock Options Granted

The fair value of the stock options granted is calculated using the Black-Scholes option-pricing model as prescribed by ASC 718 using the following assumptions:

		Year Ended		Year Ended
		December 31, 2018		December 31, 2019
Expected term (years)		6		5 – 6
Risk free interest rate		2.730% – 2.855%		2.105 – 2.610%
Volatility		105% – 107%		103 – 110%
Expected dividend yield over expected term		0.00%		0.00%
Resulting weighted average grant date fair value		$1.25		$0.71

Schedule of Restricted Stock Units Activity

Summarized information for restricted stock units’ activity for the year ended December 31, 2019 is as follows:

		Restricted Stock Units				Weighted Average Grant Date Value Per Share
Restricted Stock Units outstanding at December 31, 2019			280,000			$	0.53
Unvested at December 31, 2019			280,000			$	0.53
Vested and exercisable at December 31, 2019			0			$	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 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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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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