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Stockholders' equity - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
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

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