Stockholders' Equity - Additional Information (Details)			1 Months Ended							3 Months Ended		4 Months Ended	12 Months Ended
	Dec. 16, 2020 USD ($) $ / shares shares	Oct. 29, 2019 USD ($) $ / shares shares	Jan. 31, 2022 shares	Aug. 31, 2021 shares	Nov. 30, 2020 USD ($)	Nov. 30, 2019 $ / shares shares	Oct. 31, 2019 shares	May 31, 2019 shares	Mar. 31, 2019 shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	May 06, 2019 USD ($) shares	Dec. 31, 2019 shares	Jan. 01, 2022 shares	Dec. 31, 2021 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares authorized										40,000,000					40,000,000
Preferred stock, shares issued										0					0
Preferred stock, shares outstanding										0					0
Stock options, granted										1,238,422
Stock-based compensation cost | $										$ 5,775,000	$ 3,818,000
Common stock reserved for issuance										8,829,888
Unrecognized stock-based compensation expense | $										$ 52,300,000
Unrecognized stock-based compensation expense, weighted-average period for recognition										2 years 6 months
Defined contribution plan employer contribution liabilities expense | $										$ 600,000	$ 400,000
Defined contribution plan, employer matching contribution, percentage										75.00%
Employer discretionary match number of shares settled			16,756	18,394
Dividend yield										0.00%	0.00%
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield										0.00%
Stock options, PSUs and RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance										6,074,576
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense | $										$ 3,500,000
Unrecognized stock-based compensation expense, weighted-average period for recognition										2 years 9 months 18 days
2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized for issuance													2,231,739
Stock options, granted													1,400,528
Number of shares available for issuance							0
2019 Equity Incentive Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, granted													16,260
2019 Incentive Award Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual increase to shares available for issuance percentage of outstanding common stock							5.00%
Equity plan, description										The number of shares initially available for issuance will be increased by (i) the number of shares subject to stock options or similar awards granted under the Existing Incentive Plan that expire or otherwise terminate without having been exercised in full after the effective date of the 2019 Plan and unvested shares issued pursuant to awards granted under the Existing Incentive Plan that are forfeited to or repurchased by the Company after the effective date of the 2019 Plan, with the maximum number of shares to be added to the 2019 Plan pursuant to clause (i) above equal to 1,416,788 shares, and (ii) an annual increase on January 1 of each calendar year beginning in 2020 and ending in 2029, equal to the lesser of (a) 5% of the shares of common stock outstanding on the final day of the immediately preceding calendar year and (b) such smaller number of shares as determined by the board of directors. As of March 31, 2022, 1,861,999 shares remain available for issuance, which reflects 1,520,009 of stock option, performance-based unit, or PSU, and restricted stock unit, or RSU, awards granted, and 26,462 of awards cancelled or forfeited, during the three months ended March 31, 2022 as well as an annual increase of 1,582,802 shares authorized on January 1, 2022.
Number of shares remain available for issuance, annual increase														1,582,802
Common stock reserved for issuance										1,861,999
2019 Incentive Award Plan | Performance-Based Stock Units (PSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, granted										37,500
Stock-based compensation cost | $										$ 0
Unrecognized stock-based compensation expense | $										$ 13,400,000
2019 Incentive Award Plan | Stock options, PSUs and RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards, granted										1,520,009
Number of awards, cancelled or forfeited										26,462
2019 Incentive Award Plan | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, granted										244,087
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for issuance										802,085
Annual increase to shares available for issuance percentage of outstanding common stock							1.00%
Equity plan, description										In addition, the number of shares available for issuance under the ESPP will be annually increased on January 1 of each calendar year beginning in 2020 and ending in 2029, by an amount equal to the lesser of: (i) 1% of the shares outstanding on the final day of the immediately preceding calendar year and (ii) such smaller number of shares as is determined by the board of directors. As of March 31, 2022, 802,085 shares of common stock remain available for issuance, which includes the 39,951 shares sold to employees during the three months ended March 31, 2022
Stock-based compensation cost | $										$ 100,000	$ 100,000
Common stock reserved for issuance							270,000			802,085
Number of shares issued										39,951
Estimated weighted-average fair value | $ / shares										$ 5.31	$ 15.85
Unrecognized stock-based compensation expense | $										$ 200,000
Unrecognized stock-based compensation expense, weighted-average period for recognition										3 months 18 days
Dividend yield										0.00%	0.00%
Underwritten Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued	2,250,000
Common stock, price per share | $ / shares	$ 42.00
Proceeds from issuance initial public offering gross | $	$ 94,500,000
Purchase price per share after deducting underwriting discounts and commissions | $ / shares	$ 39.48
Net proceeds after deducting underwriters commission | $	$ 88,800,000
Purchase of additional offering expenses | $	$ 200,000
At-the-Market Offering Program
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued										0
Employee and Nonemployee Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimated weighted-average fair value | $ / shares										$ 9.30
Open Market Sale Agreement with Jefferies LLC | At-the-Market Offering Program
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sales commission payable as a percentage of sale of gross sales price per share					3.00%
Open Market Sale Agreement with Jefferies LLC | At-the-Market Offering Program | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate offering price through equity financing | $					$ 125,000,000.0
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued												2,524,852
Number of shares authorized to repurchase									3,373,408
Stock repurchase program, number of shares right lapse									843,352
Remaining number of shares to be repurchased									2,530,056
Stock repurchase program, period in force									48 months
Stock repurchase program expiration period									2023-03
Proceeds from issuance of shares | $												$ 1,000
Repurchase right lapse each month after first anniversary, shares												0.000208
Repurchases of shares						17,560
Shares aggregate repurchase price | $ / shares						$ 5.20
Employer discretionary match number of shares settled										16,756	8,356
Common Stock | 2019 Incentive Award Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional number of shares available for issuance							1,416,788
Common Stock | Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum percentage of eligible compensation contributed by participants							20.00%
Common Stock | IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued		10,997,630
Common stock, price per share | $ / shares		$ 19.00
Proceeds from Initial Public Offering (IPO) | $		$ 191,500,000
Common Stock | Underwritten Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued		1,434,473
Common Stock | Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining number of shares to be repurchased										605,957
Common Stock | First Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial repurchase right lapse rate												25.00%
Common Stock | Takeda License
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued								1,084,000
Common Stock | Founders
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining number of shares to be repurchased										316,257
Common Stock | Frazier
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued									1,491,072