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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan	$ 390,000	$ 318,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan	$ 3,000	$ 3,000
Issuance of common stock under Employee Stock Purchase Plan (in shares)	292,981	333,727
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	1,300,000
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under Employee Stock Purchase Plan	$ 25,000
Issuance of common stock under Employee Stock Purchase Plan (in shares)	5,000
Employee | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount on purchase price percentage of fair market value	85.00%
Options and PNQs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 4,100,000
Unrecognized compensation expense, weighted average period for recognition	1 year 9 months 18 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, weighted average period for recognition	3 years 1 month 6 days
Unrecognized compensation expense related to non-option	$ 7,500,000
RSUs | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted to employees	370,137
Weighted average grant date fair value of shares granted	$ 5.53
RSUs | Employee | Vesting Period of 1 Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted to employees	202,237
Vesting period	1 year
RSUs | Employee | Vesting Period of Four Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted to employees	167,900
Vesting period	4 years
Market RSU's
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, weighted average period for recognition	2 years 2 months 12 days
Unrecognized compensation expense related to non-option	$ 4,900,000

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