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Stock Award Plans - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2020 | May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 6,511,000 | $ 6,203,000 |  |
Weighted average grant date fair value of the stock options granted |  | $ 970,000 | $ 1,320,000 |  |
Weighted average grant date fair value of the stock options vested |  | $ 4,500,000 | $ 3,400,000 |  |
Total intrinsic value of options exercised |  | $ 500,000 |  |  |
Cash received from the exercise of options |  | 600,000 | $ 100,000 |  |
Total fair value of restricted stock units vested |  | 2,500,000 | 1,100,000 |  |
Total grant date fair value of restricted stock units outstanding |  | 13,300,000 | 2,300,000 |  |
Issuance of common stock under Employee Stock Purchase Plan |  | 684,000 | 656,000 |  |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan |  | $ 6,000 | $ 7,000 |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 627,000 | 653,000 |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock available for issuance |  | 1,600,000 |  |  |
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 |  | 8500.00% |  |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 10 years |  |  |
Unrecognized compensation expense, weighted average period for recognition |  | 3 years |  |  |
Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Unrecognized compensation expense, weighted average period for recognition |  | 2 years 29 days |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 36 months |  |  |
Vesting rights percentage |  | 25.00% |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Restricted Stock | Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage |  | 25.00% |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value per share |  | $ 3.77 |  |  |
Vesting date |  | May 22, 2023 |  |  |
Common stock price per share | $ 1.70 |  |  |  |
Risk-free interest rate | 0.18% |  |  |  |
Volatility | 95.00% |  |  |  |
Dividend yield | 0.00% |  |  |  |
Unrecognized compensation expense related to non-option |  | $ 11,000,000.0 |  |  |
RSUs | Less than 25th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentile |  | 25.00% |  |  |
Percent of target |  | 0.00% |  |  |
RSUs | 25th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentile |  | 25.00% |  |  |
Percent of target |  | 50.00% |  |  |
RSUs | 50th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentile |  | 50.00% |  |  |
Percent of target |  | 100.00% |  |  |
RSUs | 75th Percentile |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentile |  | 75.00% |  |  |
Percent of target |  | 200.00% |  |  |
RSUs | 90th Percentile or Higher |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentile |  | 90.00% |  |  |
RSUs | Maximum | 90th Percentile or Higher |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of target |  | 300.00% |  |  |
RSUs and Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 6,200,000 | $ 5,800,000 |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  | 300,000 | $ 400,000 |  |
Performance-based Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost |  | 200,000 |  |  |
Unrecognized compensation expense related to options |  | 400,000 |  |  |
Options and Performance-based Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to options |  | $ 4,800,000 |  |  |
2018 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity incentive plan, shares |  |  |  |  | 12,000,000
Equity incentive plan, number of shares available for grant increased by shares |  |  |  | 12,500,000 |
Exercise or strike price of fair market value of underlying common stock on date of grant reacquired or withheld |  |  |  | 100.00% |
2013 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity incentive plan, shares |  |  |  |  | 0

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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