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Share Capital (Tables)

12 Months Ended

Dec. 31, 2017

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Share Capital

As of December 31, 2017 and 2016 the share capital of the Company was as follows:

		Number of Shares
		Authorized								Issued and Outstanding
		December 31,								December 31,
		2017				2016				2017				2016
Ordinary shares of NIS 0.01 par value			100,000,000				17,600,000				13,751,390				2,305,743
Series A and A-1 preferred shares of NIS 0.01 par value			-				14,400,000				-				5,193,427

Summary of Number of Options Outstanding Under the Plan

The following table summarizes the number of options outstanding under the Plan for the years ended December 31, 2017, 2016 and 2015, and related information:

		Employees and Directors								Consultants and Service providers
		Number of options				Weighted Average price per share				Number of options				Weighted Average price per share
Outstanding as of January 1, 2015			595,823			$	3.69				332,500			$	3.14
Granted			1,098,777			$	2.99				203,826			$	2.98
Canceled/Forfeited			(8,000	)		$	5.00				(23,088	)		$	2.33
Outstanding as of December 31, 2015			1,686,600			$	3.23				513,238			$	3.48
Granted			404,813			$	3.50				132,032			$	7.15
Canceled/Forfeited			(60,800	)		$	3.03				(6,000	)		$	1.58
Exercised			-			$	-				(4,784	)		$	2.45
Outstanding as of December 31, 2016			2,030,613			$	3.29				634,486			$	4.27
Granted			712,900		*	$	24.62				-			$	-
Canceled/Forfeited			(39,500	)		$	5.77				(5,686	)		$	2.93
Exercised			(682,184	)		$	3.49				(130,038	)		$	2.92
Outstanding as of December 31, 2017			2,021,829			$	10.70				498,762			$	4.64

*Including 38,400 ordinary shares issuable upon the vesting of options granted in 2016, which were contingent upon the closing of the IPO.

Summary of Number of Options Outstanding and Exercisable

The following table summarizes the outstanding and exercisable options and restricted stock units as of December 31, 2017:

Options outstanding										Options exercisable
Exercise price per share		Number of options outstanding at end of year				Weighted average remaining contractual life				Number of options exercisable at end of year				Weighted average remaining contractual life
$0.00 - 10.00			1,948,091				4.62				1,142,310				3.98
$10.01 - 20.00			292,500				9.49				52,501				9.51
$20.01 - 30.00			100,000				9.82				-				-
$30.01 - 40.00			180,000				9.81				-				-
			2,520,591								1,194,811

Schedule of Effect of Share-Based Compensation on Statements of Operations

The following table illustrates the effect of share-based compensation on the statements of operations:

		Year ended December 31,
		2017				2016				2015
Research and development expenses		$	3,923			$	1,167			$	170
General and administrative expenses			2,377				800				279
		$	6,300			$	1,967			$	449

Employees and Directors

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Assumptions Used to Computing Fair Value of Options Granted

The fair value of options granted to employees and directors on the date of grant was computed using the Black-Scholes model. The underlying data used for computing the fair value of the options are as follows:

		2017			2016			2015
Value of ordinary shares		$13.00-39.26			$2.98-5.54			$2.98-3.01
Dividend yield		0%			0%			0%
Expected volatility		71.53%-76.32%			74.8%-80%			69.78%-76.68%
Risk-free interest rate		1.85%-2.47%			1.4%–2.13%			0.38%–2.08%
Expected term		5.5-10 years			7 years			1-7 years

Consultants and Other Service Providers

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Assumptions Used to Computing Fair Value of Options Granted

The fair value of options granted to consultants and other service providers was computed using the Black-Scholes model. The underlying data used for computing the fair value of the options are as follows:

		2017			2016			2015
Value of ordinary shares		$1.58-37.21			$1.58-7.96			$2.98
Dividend yield		0%			0%			0%
Expected volatility		68.45%-74.50%			72.72%-80%			73.31%-76.3%
Risk-free interest rate		1.38%-2.26%			1.56%-2.27%			1.88%-2.07%
Expected term		3.9-5.9 years			5.8-8.5 years			6.8-7 years

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