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Share Capital (Tables) | 12 Months Ended
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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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