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v3.21.1

Basis of Presentation, Liquidity and Risks and Uncertainties (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net loss | $ 54,402,131 | $ 32,541,054 |
Working capital | 546,900,000 |  |
Retained earnings (accumulated deficit) | (960,598,943) |  | $ (906,196,812)
Cash, cash equivalents, and short-term investments | 518,600,000 |  |
Proceeds from issuance of stock | $ 162,105,030 | $ 208,241,933 |
Common stock | Underwritten Public Offering |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Proceeds from issuance of stock |  |  | 162,100,000
Common stock | Sales Agreements |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Proceeds from issuance of stock |  |  | $ 454,500,000

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