The number of common and preferred shares authorized by the Company.

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Number of warrants or rights exercisable.

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Common Stock [Abstract]

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Stockholders' equity - Narrative (Details)		12 Months Ended
Stockholders' equity - Narrative (Details)	Jan. 05, 2017	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Stockholders' Equity
Authorized Shares of Common Stock		50,000,000	200,000,000
Issued and Outstanding Shares of Preferred Stock		0	0
Issued and Outstanding Shares of Common Stock		15,098,837	8,895,094
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.0333
Common Stock
Common Stock, Voting Rights, Number of Votes Per Share		1
Share-based Compensation
Nonvested Share-based Compensation \| $			$ 111,243
Share-based Compensation Expense \| $		$ 263,396	$ 122,134	$ 218,294
Share-based Compensation, Fair Value of Options Granted \| $ / shares		$ 2.50	$ 4.55	$ 4.46
Share-based Compensation, Intrinsic Value of Options Granted \| $			$ 43,420	$ 6,338
Share-based Compensation, Intrinsic Value of Options Outstanding \| $		$ 0	17,454	602,773
Share-based Compensation, Intrinsic Value of Options Exercisable \| $		$ 0	$ 17,454	$ 597,872
Original Number of Shares Authorized
Stockholders' Equity
Authorized Shares of Common and Preferred Stock		240,000,000
Current Number of Shares Authorized
Stockholders' Equity
Authorized Shares of Common and Preferred Stock		55,000,000
Authorized Shares of Preferred Stock		5,000,000
Authorized Shares of Common Stock		50,000,000
Employee Stock Option
Common Stock
Shares of Common Stock for the Exercise of Options		339,964
Shares of Common Stock for the Exercise of Warrants		1,745,868
Share-based Compensation
Expected dividend yield		0.00%	0.00%	0.00%
Share-based Compensation Expense \| $		$ 236,098	$ 95,734	$ 200,224
Unearned Share-based Compensation earn period		1 year 2 months 12 days
Share-based Compensation, Exercise Term			10 years
2016 Equity Incentive Plan
Share-based Compensation
Share-based Compensation, Shares Available for Grant				450,000
Restricted Stock
Share-based Compensation
Nonvested Share-based Compensation Expense in Future Periods \| $			$ 31,015
Unearned Share-based Compensation earn period		2 years 2 months 12 days
Board of Directors Chairman [Member] \| Restricted Stock
Share-based Compensation
Share-based Compensation Expense \| $		$ 27,298	$ 26,400	$ 18,070
Minimum \| Employee Stock Option
Share-based Compensation
Award Vesting Period			1 year
Maximum \| Employee Stock Option
Share-based Compensation
Award Vesting Period			3 years
2016 Equity Incentive Plan
Share-based Compensation
Share-based Compensation, Shares Available for Grant		268,138	397,500	450,000