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Redeemable Convertible Preferred Stock (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 01, 2018 shares | May 31, 2020 shares | Apr. 30, 2020 shares | Jan. 31, 2020 shares | Nov. 30, 2018 USD ($) shares | Dec. 31, 2019 shares | Jun. 30, 2020 USD ($) installment shares
Series C Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Redeemable preferred stock |  |  |  |  |  |  |
Number of shares of common stock issued on conversion of preferred stock |  | 1,858,256 | 923,819 |  |  |  |
Number of preferred shares that had been converted to common stock |  | 1,750 | 870 |  |  |  |
Series E Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Redeemable preferred stock |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 35,000 |  |
Net proceeds from public offering | $ |  |  |  |  | $ 30.9 |  |
Number of monthly installments | installment |  |  |  |  |  |  | 13
Redemption value for each installment | $ |  |  |  |  |  |  | $ 2.7
Shares outstanding (in shares) |  |  |  |  |  | 500 | 0
Series E Preferred Stock |  |  |  |  |  |  |
Redeemable preferred stock |  |  |  |  |  |  |
Shares issued (in shares) | 35,000 |  |  |  |  |  |
Number of shares of common stock issued on conversion of preferred stock |  |  |  | 500 |  | 30,462 |
Number of preferred shares that had been converted to common stock |  |  |  | 500 |  |  |

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