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Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Apr. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Feb. 28, 2021 | Jul. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 90,000,000 |  |  | 90,000,000 | 90,000,000 |  |
Proceeds from common stock offerings, net |  |  | $ 258,105 | $ 104,615 |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |
Preferred stock, shares authorized |  |  | 4,000,000 |  |  | 4,000,000 | 4,000,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 2,875,000 |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  | 2,875,000 | 4,028,410 | 1,400,251 |  |  |  |  |
Proceeds from common stock offerings, net |  | $ 170,400 |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 3,450,000 | 6,166,666 |  |  |  |  |  |  |
Proceeds from common stock offerings, net |  |  |  |  |  | $ 354,600 |  |  |
At-Market Equity Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  | 3,169,754 |  |  |  |  |
At-Market Equity Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  | 2,003,118 |  |  |  |
Proceeds from common stock offerings, net |  |  |  |  |  |  | $ 359,500 |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  |  |  | $ 400,000
At-Market Equity Program Three [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  | $ 0 |  |  |  |  |
At-Market Equity Program Four [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  | 3,334,056 |  |
Issuance of common stock, net of issuance costs (in shares) |  |  |  |  |  |  | 782,484 |  |
Proceeds from common stock offerings, net |  |  |  |  |  |  | $ 49,400 |  |
Value Of Equity Instruments To Be Issued |  |  |  | $ 400,000 |  |  |  |  |
At-Market Equity Program Five [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  | 372,469 |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  | 0 |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  |  | $ 500,000 |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 375,000 |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 450,000 |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from common stock offerings, net | $ 221,400 |  |  |  |  |  |  |  |

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