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Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 05, 2020 | Nov. 11, 2018 | Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Equity [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  |  | 350,000,000 | 250,000,000
Initial Public Offering of Common Stock |  |  |  | $ 0.001 | $ 0.001
Net Proceeds from Underwriting |  |  |  |  | $ 13,016
Issuance of common stock in connection with a public offering, net |  |  |  | $ 0 | $ 88,661
Common stock, shares outstanding |  |  |  | 216,127,443 | 214,591,906
Common Stock [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  |  | 350,000,000 |
Net Proceeds from Underwriting |  |  |  |  | $ 3
Common stock, shares outstanding |  |  |  | 216,127,443 |
Common Stock, shares reserved for future issuance |  |  |  | 33,620,711 |
Maximum [Member] | At The Market Offering [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Net Proceeds from Underwriting |  |  | $ 100,000 |  |
Underwriting Agreement [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Issuance of common stock in connection with a public offering, net | $ 84,800 |  |  |  |
Issuance & sale of common stock in public offering price per share | $ 3.25 |  |  |  |
Underwriting Agreement [Member] | At The Market Offering [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Issuance of common stock in connection with a public offering, net |  |  |  |  | $ 13,000
Securities Purchase Agreement [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Net Proceeds from Underwriting |  | $ 47,100 |  |  |

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