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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) | 3 Months Ended
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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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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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