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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2022 | Jan. 31, 2022 | Apr. 07, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Apr. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jul. 15, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  | 1,000,000,000 |  |  |  | 1,000,000,000 |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.0001 |  |  |  | $ 0.0001 |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  | 98,137,070 |  |  |  | 96,751,610 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  | 98,137,070 |  |  |  | 96,751,610 |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  |  |  |  | $ 0 | $ 29,670 |  |  |  |  |  |
Proceeds not received related to sales of common stock |  |  |  |  |  |  | $ 0 | $ 867 |  |  |  |  |  |
Number of warrants (in shares) |  |  |  |  |  |  | 5,636,801 |  |  |  | 5,636,801 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 72,736,000 | 98,137,000 | 72,736,000 |  | 97,251,000 | 96,752,000 | 71,204,000 | 56,371,000 |
Sales of common stock, net of issuance costs (in shares) |  |  |  |  |  | 692,000 |  | 15,123,000 |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant, term |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Number of warrants (in shares) |  |  |  | 3,840,000 |  |  |  |  |  |  |  |  | 2,160,000 | 2,160,000
Additional warrant shares registered (as a percent) |  |  |  |  |  |  |  |  | 250.00% |  |  |  |  |
Common Stock | Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  | $ 2.25 |  |  |  |  |  |  |  |  | $ 4.00 | $ 4.00
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  | $ 100,000 | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Aggregate net proceeds received | $ 200,000 |  |  |  |  |  |  | $ 979 |  |  |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  |  |  |  |  | 112 |  |  |  |  |  |
Payments of stock offering costs |  |  |  |  |  |  |  | 30 |  |  |  |  |  |
Additional transaction costs |  |  |  |  |  | $ 147 |  | 147 |  |  |  |  |  |
Gross proceeds of sales price per share (as a percent) |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds not received related to sales of common stock |  |  |  |  |  |  |  | $ 867 |  |  |  |  |  |
At Market Issuance Sales Agreement | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of common stock, net of issuance costs (in shares) |  |  |  |  |  |  |  | 691,584 |  |  |  |  |  |
At-The-Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  |  | $ 5,058 |  |  |  |  |  |  |  |  |
Payments of stock offering costs |  |  |  |  | $ 156 |  |  |  |  |  |  |  |  |
At-The-Market Offering | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of common stock, net of issuance costs (in shares) |  |  |  |  | 2,670,121 |  |  |  |  |  |  |  |  |
Underwritten Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of common stock, net of issuance costs |  |  |  | $ 24,722 |  |  |  |  |  |  |  |  |  |
Payments of stock offering costs |  |  |  | 1,740 |  |  |  |  |  |  |  |  |  |
Additional transaction costs |  |  |  | $ 75 |  |  |  |  |  |  |  |  |  |
Underwritten Offering | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of common stock, net of issuance costs (in shares) |  |  |  | 11,761,111 |  |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  | $ 2.25 |  |  |  |  |  |  |  |  |  |

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