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Subsequent Events (Details) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 24, 2020 USD ($) item $ / shares shares | Jan. 31, 2020 $ / shares shares | Aug. 16, 2019 shares | Jan. 14, 2019 $ / shares shares | Apr. 16, 2018 $ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 175,668 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years | 36 months |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  | $ 2.74 | $ 8.72 | $ 3.10 | $ 6.39
Common Stock, Shares, Issued |  |  |  |  |  | 17,100,726 | 11,468,996
Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 636,287 | 11,000 |  |  | 313,674
Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 45,285 |  |  |  | 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 24 months | 24 months |  |  | 36 months
Employees Consultants and Directors Under the 2018 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 681,572 | 11,000 |  |  | 395,999
Subsequent Event [Member] |  |  |  |  |  |  |
Securities Purchased under Agreements to Resell, Liability | $ | $ 6.0 |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ | $ 5.3 |  |  |  |  |  |
Common Stock, Shares, Issued | 2,675,293 |  |  |  |  |  |
Subsequent Event [Member] | IPO [Member] |  |  |  |  |  |  |
Number of Units Sold | $ / shares | $ 2.21425 |  |  |  |  |  |
Subsequent Event [Member] | Directors and Executive Officers [Member] |  |  |  |  |  |  |
Number of Units Sold | $ / shares | $ 2.42625 |  |  |  |  |  |
Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |
Number of Share | item | 1 |  |  |  |  |  |
Subsequent Event [Member] | Class A Warrant [Member] |  |  |  |  |  |  |
Purchase Term of Warrant | 1 year |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 0.5 |  |  |  |  |  |
Maximum Number of Warrants To Purchase Common Stock | 1,337,659 |  |  |  |  |  |
Subsequent Event [Member] | Class A Warrant [Member] | IPO [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.058 |  |  |  |  |  |
Subsequent Event [Member] | Class A Warrant [Member] | Directors and Executive Officers [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.27 |  |  |  |  |  |
Subsequent Event [Member] | Class B Warrant [Member] |  |  |  |  |  |  |
Purchase Term of Warrant | 5 years |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 0.75 |  |  |  |  |  |
Maximum Number of Warrants To Purchase Common Stock | 2,006,495 |  |  |  |  |  |
Subsequent Event [Member] | Class B Warrant [Member] | IPO [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.4696 |  |  |  |  |  |
Subsequent Event [Member] | Class B Warrant [Member] | Directors and Executive Officers [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 2.724 |  |  |  |  |  |
Subsequent Event [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.33% |  |  |  |  |
Subsequent Event [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 24 months |  |  |  |  |
Subsequent Event [Member] | Employees Consultants and Directors Under the 2018 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 25,000 |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  | $ 4.68 |  |  |  |  |

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