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v3.21.1

Preferred Stock (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 28, 2021 | Oct. 01, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 5,000,000 |  |
Preferred stock designated share |  |  | 1,941,250 |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  |
Preferred stock, shares outstanding (in shares) |  |  | 0 |  | 1,829,582
Accrued dividends on Series A-2 Preferred Stock |  |  | $ 0 |  | $ 4,000
Dividends |  |  | $ 1,000 |  |
Preferred stock conversion | $ 300,000 |  |  |  |
Conversion of convertible preferred stock, shares (in shares) |  | 1,315,790 |  |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued in conversion (in shares) | 84,292 |  |  |  | 20,954
Conversion of convertible preferred stock, shares (in shares) |  |  | 18,846,411 | 50,000 |
Restricted stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting period |  |  | 10 years |  |
Series A-2 Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 7,500 |  | 7,500
Preferred stock, shares issued (in shares) |  |  | 0 |  | 45
Preferred stock, shares outstanding (in shares) | 45 |  | 0 |  | 45
Preferred stock, stated value |  |  | $ 7,500 |  | $ 7,500
Stock issued during period, conversion of convertible securities, price (in dollars per share) | $ 4.00 |  |  |  | $ 16.11
Preferred stock percentage |  |  |  |  | 5.00%
Series A-2 Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Conversion of convertible preferred stock, shares (in shares) |  |  | (45) |  |
Series A-2 Preferred Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  |  |  |  | 466
Conversion of convertible preferred stock, shares (in shares) |  |  | 84,292 |  |
Series D Convertible Preferred Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 17,416,939 |  |  |
Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 1,750,000 |  | 1,750,000
Preferred stock, shares issued (in shares) |  |  | 0 |  | 1,697,958
Preferred stock, shares outstanding (in shares) |  |  | 0 |  | 1,697,958
Preferred stock, stated value |  |  | $ 28.50 |  | $ 28.50
Shares issued in conversion (in shares) |  | 1,697,022 |  |  |
Preferred stock percentage |  | 6.00% |  |  |
Conversion of convertible preferred stock, shares (in shares) |  | 1,686,659 |  |  |
Forfeited, restricted shares (in shares) |  |  | 81 |  | 28,618
Series D Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 855 |  | 8,325
Conversion of convertible preferred stock, shares (in shares) |  |  | (1,697,022) |  |
Series D Preferred Stock | Restricted stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of restricted stock (in shares) |  | 49,967 |  |  |
Vesting period |  | 2 years |  |  |
Forfeited, restricted shares (in shares) |  |  | 81 | 14,441 |
Series E Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 175,000 |  | 175,000
Preferred stock, shares issued (in shares) |  |  | 0 |  | 131,579
Preferred stock, shares outstanding (in shares) |  | 131,579 | 0 |  | 131,579
Preferred stock, stated value |  | $ 28.50 | $ 28.50 |  | $ 28.50
Shares issued in conversion (in shares) |  | 131,579 |  |  |
Preferred stock percentage |  |  | 6.00% |  |
Series E Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Conversion of convertible preferred stock, shares (in shares) |  |  | (131,579) |  |
Series E Preferred Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 1,345,180 |  |  |
Series E Preferred Stock | Series E Financing |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 131,579 |  |  |
Stock issued during period, conversion of convertible securities, price (in dollars per share) |  | $ 2.85 |  |  |
Sale of stock consideration received |  | $ 3,750,000 | $ 3,750,000 |  |
Sale of stock, price per share (in dollars per share) |  | $ 2.85 |  |  |

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