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Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-Based Compensation

Schedule of share-based compensation expense

Share-based compensation expense was included in general and administrative and research and development expenses as follows in the accompanying condensed statements of comprehensive loss (in thousands):

	Three Months Ended							Nine Months Ended
	September 30,							September 30,
		2019			2018				2019			2018
General and administrative	$	276		$	861			$	835		$	2,008
Research and development		165			766				517			1,548
Total share-based compensation	$	441		$	1,627			$	1,352		$	3,556

Schedule of weighted-average assumptions, option-pricing model

The weighted‑average assumptions used in the Black‑Scholes option‑pricing and Monte Carlo simulation models are as follows:

			Three Months Ended					Nine Months Ended
			September 30,					September 30,
			2019		2018			2019		2018
Expected stock price volatility			—		—			—		66.3%
Expected life of options (years)			—		—			—		5.8
Expected dividend yield			—		—			—		0%
Risk free interest rate			—		—			—		2.7%

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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- Definition

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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