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Stockholders' equity (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2022 $ / shares shares | Feb. 25, 2022 shares | Feb. 24, 2022 shares | Dec. 06, 2021 USD ($) $ / shares shares | Jul. 07, 2021 USD ($) $ / shares shares | May 18, 2021 USD ($) shares | Nov. 24, 2020 USD ($) $ / shares shares | Mar. 23, 2020 USD ($) shares | Nov. 30, 2020 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Jul. 15, 2021 shares | Dec. 30, 2020 $ / shares | Nov. 20, 2020 $ / shares | Sep. 27, 2017 $ / shares shares
Stock issued during period, shares, issued for services |  |  |  |  |  |  |  | 35,592 |  |  |  |  |  |  |  |
Common shares issued for service | $ |  |  |  |  |  |  |  | $ 33,812 |  |  |  | $ 33,812 |  |  |  |
Issuance of common stock (in shares) |  |  |  | 21,120,509 | 5,380,000 |  | 6,060,608 |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  | $ 0.65 | $ 1.30 |  | $ 1.65 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock gross | $ |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
Issuance of common stock | $ |  |  |  | $ 12,423,706 | $ 6,939,000 |  | $ 9,100,000 |  |  |  | $ 19,362,706 | $ 9,055,000 |  |  |  |
Proceeds from issuance of common stocks | $ |  |  |  |  |  |  |  |  | $ 9,100,000 | $ 5,600,000 | $ 19,400,000 |  |  |  |  |
Stock split ratio |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  | 6,399,460 | 3,589,409 |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  |  |  |  | 6,399,460 | 3,589,409 |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  | 60,000,000 | 60,000,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, issued for services |  |  |  |  |  |  |  | 3,559 |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 2,112,051 | 538,000 |  | 606,061 |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  | $ 6.50 | $ 13.00 |  | $ 16.5 |  |  |  |  |  |  |  |  |
Split-adjusted | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |
Split-adjusted | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split ratio |  | 0.1 | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares outstanding automatically combines and converts |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 6,399,460 | 63,994,606 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 6,399,460 | 6,399,460 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 60,000,000 | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
September 2017 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  | 944,655 |  |  |  | 1,078,045
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 4.25 | $ 0.001 |
Description Warrants Exercise Term |  |  |  |  |  |  |  |  |  |  | The exercisability of the warrants may be limited if, upon exercise, the holder or any of its affiliates would beneficially own more than 4.99% of the Company’s common shares. |  |  |  |  |
September 2017 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  | 94,465 |  |  |  | 107,804
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 42.5 | $ 0.01 |
November 2020 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of warrant |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  | $ 1.81 |  |  |  | $ 1.87 |  |  |  |  |
Class of warrant or right, outstanding |  |  |  |  |  |  |  |  |  |  | 6,557,635 |  |  |  |  |
Weighted Average Remaining Life of Warrants |  |  |  |  |  |  |  |  |  |  | 3 days 17 hours |  |  |  |  |
November 2020 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  | $ 18.10 |  |  |  | $ 18.70 |  |  |  |  |
Class of warrant or right, outstanding |  |  |  |  |  |  |  |  |  |  | 655,764 |  |  |  |  |
Investor Warrants [Member] | September 2017 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 945,654
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.25
Investor Warrants [Member] | September 2017 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,565
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42.5
Placement Agent Warrants [Member] | September 2017 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,391
Term of warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.675
Placement Agent Warrants [Member] | September 2017 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,239
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46.75
Registered Warrants [Member] | November 2020 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 2,754,820 |  |  |  |  |  |  |  |  |
Registered Warrants [Member] | November 2020 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 275,482 |  |  |  |  |  |  |  |  |
Unregistered Warrants [Member] | November 2020 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 3,305,788 |  |  |  |  |  |  |  |  |
Unregistered Warrants [Member] | November 2020 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 330,579 |  |  |  |  |  |  |  |  |
Placement agent [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | 2,880,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Placement agent [Member] | Unregistered Warrants [Member] | November 2020 Offering Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  | 363,637 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.815 |  |  |  |  |
Placement agent [Member] | Unregistered Warrants [Member] | November 2020 Offering Warrants | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  | 36,364 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 18.15 |  |  |  |  |
Under 2014 Shares Incentive Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock to employees (in shares) |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock to employees | $ |  |  |  |  |  | $ 1,840,000 |  |  |  |  |  |  |  |  |  |
Under 2014 Shares Incentive Plans [Member] | Split-adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock to employees (in shares) |  |  |  |  |  | 160,000 |  |  |  |  |  |  |  |  |  |

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