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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 700,000 | $ 390,000 | $ 366,000 | $ 318,000 |  |
Common Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 2,000 | $ 3,000 | $ 3,000 | $ 3,000 |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) | 234,000 | 293,000 | 293,000 | 334,000 | 527,049 | 626,818
ESPP |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance | 1,100,000 |  |  |  | 1,100,000 |
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 | 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 | $ 300,000 |  |  |  | $ 300,000 |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  | 1 year 8 months 19 days |
RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  | 3 years 2 months 8 days |
Unrecognized compensation expense related to non-option | 11,600,000 |  |  |  | $ 11,600,000 |
Market RSU's |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  | 2 years 3 months 21 days |
Unrecognized compensation expense related to non-option | $ 11,200,000 |  |  |  | $ 11,200,000 |

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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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