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

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Common Stock [Abstract]

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Warrants [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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Exercise price per share or per unit of warrants or rights outstanding.

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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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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Expected term of share-based compensation awards, 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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Value of preferred stock and warrants for common stock issued.

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Number of new stock issued during the period.

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Stockholders' equity - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
Stockholders' equity - Narrative (Details) - USD ($)	Jan. 31, 2018	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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			21,635,365	15,098,837
Common Stock
Common Stock, Voting Rights, Number of Votes Per Share			1
Warrants [Abstract]
Exercise price (in dollars per share)			$ 3.25
Share-based Compensation
Share-based Compensation Expense			$ 872,177	$ 263,396	$ 122,134
Stock option grants (in dollars per share)			$ 1.62	$ 2.50	$ 4.55
Intrinsic vale of options exercised				$ 0	$ 43,420
Intrinsic vale of options outstanding			$ 776	0	17,454
Intrinsic vale of options exercisable			0	0	17,454
Nonvested Share-based Compensation				179,410
Share-based compensation			$ 872,177	263,396	122,134
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
Share-based Compensation
Share-based Compensation Expense			$ 486,773	$ 236,098	$ 95,734
Unearned Share-based Compensation earn period			10 months 24 days
Share-based Compensation, Exercise Term				10 years
Expected dividend yield			0.00%	0.00%	0.00%
Expected volatility				81.00%	78.00%
Risk free interest rate				2.60%	1.80%
Expected life (in years)			5 years	5 years	5 years
Restricted Stock
Share-based Compensation
Nonvested Share-based Compensation Expense in Future Periods				$ 91,930
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			$ 385,404	$ 27,298	$ 26,400
Minimum \| Employee Stock Option
Share-based Compensation
Award Vesting Period				1 year
Expected volatility			89.00%
Risk free interest rate			1.55%
Maximum \| Employee Stock Option
Share-based Compensation
Award Vesting Period				3 years
Expected volatility			100.00%
Risk free interest rate			2.85%
2016 Equity Incentive Plan, Original Grants [Member]
Share-based Compensation
Share-based Compensation, Shares Available for Grant						450,000
2016 Equity Incentive Plan
Share-based Compensation
Share-based Compensation, Shares Available for Grant			198,034	268,138	397,500	900,000
2016 Equity Incentive Plan, Additional Grants [Member]
Share-based Compensation
Share-based Compensation, Shares Available for Grant						450,000
Warrant [Member]
Warrants [Abstract]
Issued (in shares)			0
Exercise price (in dollars per share)			$ 3.25	$ 3.25
Accelerated share-based compensation summary [Member] \| Chief Executive Officer [Member]
Share-based Compensation
Expected dividend yield		0.00%
Share-based compensation		$ 134,258
Number of options for the Company's former CEO		153,940
Expected volatility		97.00%
Accelerated share-based compensation summary [Member] \| Chief Executive Officer [Member] \| Minimum
Share-based Compensation
Risk free interest rate		1.71%
Expected life (in years)		1 year 6 months
Accelerated share-based compensation summary [Member] \| Chief Executive Officer [Member] \| Maximum
Share-based Compensation
Risk free interest rate		1.92%
Expected life (in years)		5 years
January 2018 Public Offering [Member] \| Warrant [Member]
Warrants [Abstract]
Issued (in shares)	4,246,153		4,246,153
Exercise price (in dollars per share)			$ 3.25
January 2018 Public Offering [Member] \| January 2018 Public Offering, Discounted Warrants [Member] \| Warrant [Member]
Warrants [Abstract]
Issued (in shares)			2,250,461
Exercise price (in dollars per share)			$ 2.00
Intrinsic value of warrants converted			$ 1,800,000