Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,300,000
Increase total number of shares reserved	1,300,000
Stock price	$ 7.32
Total unrecognized stock-based compensation expense related to stock options granted	$ 12.7
2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Description of share based payment award	Awards may be made under the 2019 Plan for up to the sum of (i) 2,300,000 shares of common stock and (ii) such additional number of shares of common stock (up to 1,068,901 shares) as is equal to (x) the number of shares of common stock reserved for issuance under the 2010 Plan that were available for grant under the 2010 Plan immediately prior to the date the 2019 Plan was approved by the Company’s stockholders and (y) the number of shares of common stock subject to awards outstanding under the 2010 Plan, which awards expire, terminate or are otherwise surrendered, cancelled, forfeited or repurchased by the Company pursuant to a contractual repurchase right.
Shares of common stock available for future issuance	292,420
Employee Stock Purchase Plan, 2010
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock available for future issuance	0
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards, vesting period	4 years
Awards, Expiration period	10 years
Weighted-average grant date fair value of stock options granted	$ 7.03	$ 4.50
Total unrecognized stock-based compensation expense, weighted-average period Recognition	3 years 4 months 24 days
Minimum \| Stock Options \| Participants Who Own Less Than Ten Percent Of Combined Voting Power
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of incentive stock options as percentage of fair market value of common stock on the date of the award	100.00%
Maximum \| 2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,300,000
Common stock reserved for issuance	1,068,901
Maximum \| Stock Options \| Participants Who Own More than 10% of Total Combined Voting Power
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of incentive stock options as percentage of fair market value of common stock on the date of the award	110.00%

Common stock increase in capital shares reserved for future issuance in period shares.

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