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Financing Transactions (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | May 11, 2018
Financing Transactions [Line items] |  |  |  |  |
Gross proceeds from sale of securities |  |  | $ 56,100,000 | $ 90,300,000 |
Proceeds from sale of commons stock |  |  |  | $ 11,500,000 |
Sales of stock (in shares) |  |  |  | 2,300,000 |
Interest rate |  |  |  |  | 4.00%
Gross proceeds from warrants |  |  |  | $ 82,035 |
Warrants to purchase common shares |  |  |  | 16,407 |
Net proceeds from sale of securities |  |  |  | $ 31,500,000 |
ATM |  |  |  |  |
Financing Transactions [Line items] |  |  |  |  |
Proceeds from sale of commons stock |  |  |  | $ 20,533,208 |
Sales of stock (in shares) |  |  |  | 4,354,773 |
June 2024 Notes |  |  |  |  |
Financing Transactions [Line items] |  |  |  |  |
Proceeds from sale of unsecured, unsubordinated notes |  |  |  | $ 23,663,000 |
Interest rate | 7.125% |  | 7.125% | 7.125% |
December 2024 Notes |  |  |  |  |
Financing Transactions [Line items] |  |  |  |  |
Proceeds from sale of unsecured, unsubordinated notes |  |  |  | $ 34,500,000 |
Interest rate | 6.875% |  | 6.875% | 6.875% |
September 2025 Notes |  |  |  |  |
Financing Transactions [Line items] |  |  |  |  |
Proceeds from sale of unsecured, unsubordinated notes | $ 27,720,000 | $ 28,363,750 |  |  |
Interest rate | 7.75% | 7.75% | 7.75% |  |

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