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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 740,000 | $ 390,000
Common Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 2,000 | $ 3,000
Issuance of common stock under Employee Stock Purchase Plan (in shares) | 233,401 | 292,981
Employee Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Common stock available for issuance | 900,000 |
Employees Awards |  |
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 |
Employees Awards | Employee Stock |  |
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 | $ 1,500,000 |
Unrecognized compensation expense, weighted average period for recognition | 1 year 2 months 12 days |
RSUs |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Unrecognized compensation expense, weighted average period for recognition | 2 years 10 months 9 days |
Unrecognized compensation expense related to non-option | $ 9,400,000 |
Market RSU's |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Unrecognized compensation expense, weighted average period for recognition | 1 year 10 months 2 days |
Unrecognized compensation expense related to non-option | $ 8,600,000 |

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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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