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Stock Option Plan - Summary of stock-based compensation activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Number of Stock Options Outstanding
Balance, January 1, 2018	1,855,138
Options granted	135,000
Options exercised	(105,378)
Options forfeited/canceled	(6,410)
Balance, June 30, 2018	1,878,350	1,855,138
Exercisable as of June 30, 2018	1,508,900
Weighted Average Exercise Price
Balance, January 1, 2018	$ 2.69
Options granted	8.00
Options exercised	2.32
Options forfeited/canceled	3.44
Balance, June 30, 2018	3.09	$ 2.69
Exercisable as of June 30, 2018	$ 2.77
Weighted Average Remaining Contractual Term, Options Outstanding (in years)	7 years 2 months 23 days	7 years 5 months 23 days
Weighted Average Remaining Contractual Term, Options Exercisable (in years)	6 years 11 months 9 days
Aggregate Intrinsic Value, Options Outstanding	$ 23,216	$ 9,850
Aggregate Intrinsic Value, Options Exercisable	$ 19,131

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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