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Stock Plans - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Accrued employee contributions | $ 2,334,000 |  | $ 2,486,000
Employee Stock Purchase Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock were purchased under ESPP | 62,469 |  |
Accrued employee contributions | $ 99,000 |  |
Timebased Stock Option [Member] |  |  |
Class of Stock [Line Items] |  |  |
Options granted | 551,500 |  |
Restricted Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Unrecognized cost of share-based compensation awards | $ 57,000 |  |
Cost of share-based compensation awards, recognition period | 3 months 18 days |  |
Restricted Stock Units [Member] |  |  |
Class of Stock [Line Items] |  |  |
Unrecognized cost of share-based compensation awards | $ 7,574,000 |  |
Cost of share-based compensation awards, recognition period | 10 months 24 days |  |
Performance-based Stock Options [Member] |  |  |
Class of Stock [Line Items] |  |  |
Cost of share-based compensation awards, recognition period | 2 years 10 months 24 days |  |
Weighted Average Grant Date Fair Value, Granted |  | $ 2.57 |
Total grant date fair value of stock options granted | $ 0 |  |
Total grant date fair value of stock options vested | 0 | $ 0 |
Unrecognized compensation expense related to stock options | $ 17,259,000 |  |
Stock Options [Member] |  |  |
Class of Stock [Line Items] |  |  |
Options granted | 551,500 |  |
Cost of share-based compensation awards, recognition period | 2 years 4 months 24 days |  |
Weighted Average Grant Date Fair Value, Granted | $ 2.06 | $ 3.72 |
Total grant date fair value of stock options vested | $ 4,067,000 | $ 5,465,000 |
Unrecognized compensation expense related to stock options | 5,122,000 |  |
Aggregate intrinsic value of the options exercised | $ 177,000 | $ 177,000 |

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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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