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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 |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 30, 2019 | Jan. 31, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2019 | Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 90,000,000 |  |  |  | 90,000,000 |  |  | 90,000,000 |  | 90,000,000 | 90,000,000 | 90,000,000 |  |  | 45,000,000 |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 896,118 | $ 472,746 | $ 339,744 |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.0001 |  |  |  |  |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  |  |  |
Preferred stock, shares authorized | 4,000,000 |  |  |  |  |  |  | 4,000,000 |  | 4,000,000 | 4,000,000 | 4,000,000 |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redesignated of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 2,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 2,875,000 |  |  |  |  |  |  | 14,418,612 | 7,993,519 | 6,507,263 |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  | $ 170,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 3,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  | $ 221,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 6,166,666 | 3,162,500 | 3,500,000 |  |  |  |  |  |  |  |  |  |  | 3,450,000
Stock Issued During Period, Shares, New Issues | 3,162,500 |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  | $ 195,800 |  |  | $ 186,000 |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  |  | 886,768 | 3,057,263 |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  |  | $ 58,500 | $ 180,300 |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  |  |  |  | 0 | $ 0 |  |  |  |  | $ 250,000 |
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 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  | 444,228 |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  | $ 32,600 |  | 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 | $ 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 |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value |  |  |  |  |  |  |  |  |  | 3,129,982 | 3,129,982 |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  |  |  |  |  |  |  | $ 177,700 | $ 177,700 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  | 204,074 |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 12,500 |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
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] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 412,500 |  |  |  |  |  |  |  |  |  |  |  | 450,000
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  | 3,450,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  | $ 160,200 |  |  |  |  |  |  |  |  |  |  |

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