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Organization and Description of Business - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
May 22, 2020 | Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2021 shares | Dec. 31, 2020 shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reverse stock split, conversion ratio | 0.13986014 |  |  |
Common stock, shares issued (in shares) |  |  | 36,083,301 | 35,552,795
Initial Public Offering |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reverse stock split, conversion ratio |  | 7.15 |  |
Initial public offering, shares issued (in shares) |  | 10,350,000 |  |
Share price of shares issued in initial public offering (in dollars per share) | $ / shares |  | $ 16.00 |  |
Proceeds from the initial public offering | $ |  | $ 148.3 |  |
Underwriting discounts, commissions and offering expenses | $ |  | $ 5.7 |  |
Convertible preferred stock converted into common shares |  | 160,389,279 |  |
Reclassification of convertible preferred stock into additional paid in capital upon initial public offering | $ |  | $ 238.3 |  |
Initial Public Offering | Underwriters |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Initial public offering, shares issued (in shares) |  | 1,350,000 |  |
Initial Public Offering | Common Stock |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Initial public offering, shares issued (in shares) |  | 9,000,000 |  |
Private Placement | Novartis |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Common stock, shares issued (in shares) |  | 625,000 |  |
Share price | $ / shares |  | $ 16.00 |  |
Proceeds from issuance of common stock | $ |  | $ 10.0 |  |
Private Placement | Pliant Therapeutics, Inc. | Novartis |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of noncontrolling ownership |  | 6.10% |  |

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