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Shareholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 06, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 16, 2017
Class of Stock [Line Items] |  |  |  |  |
Number of stock option granted |  | 1,215,000 |  |  |
Share-based compensation expense |  | $ 1,800,000 | $ 2,700,000 | $ 3,100,000 |
Tax benefit related to stock based compensation expense |  | $ 300,000 | 400,000 | 500,000 |
Discount from market price |  | 15.00% |  |  |
Employees offering dates intervals |  | 6 months |  |  |
Number of shares authorized in employee stock purchase plan |  | 1.3 |  |  |
Employee stock purchase plan period |  | 10 years |  |  |
Employee stock purchase plan number of shares remain available for future issuance |  | 1,300,000 |  |  |
Employee stock purchase plan expense |  | $ 20,000 | 60,000 | 90,000 |
Estimated weighted-average fair value of stock options granted |  | $ 1.98 |  |  |
Expected volatility rate |  | 52.50% |  |  |
Expected term period |  | 5 years |  |  |
Risk-free interest rate |  | 0.30% |  |  |
Cash received from employee stock option exercised |  | $ 0 | 7,000 | 100,000 |
Intrinsic value of option exercised |  | $ 0 | $ 300,000 | $ 24,000,000,000 |
Chief Executive Officer [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
2017 stock options or stock awards, vesting period | 4 years |  |  |  |
Number of stock awards granted | 1.2 |  |  |  |
Fair value of stock awards granted | $ 2.4 |  |  |  |
2017 Plan [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares available for future grant |  | 1,100,000 |  |  |
2017 Plan [Member] | Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 1,900,000
2017 Plan [Member] | Minimum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 3 years |  |  |
2017 Plan [Member] | Maximum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 4 years |  |  |
2007 Plan [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of stock option granted |  | 0 |  |  |
Employee Stock Option [Member] | 2017 Plan [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 4 years |  |  |
Restricted Stock Units [Member] | Chief Executive Officer [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
2017 stock options or stock awards, vesting period | 4 years |  |  |  |
Number of stock awards granted | 94,000 |  |  |  |
Fair value of stock awards granted | $ 0.6 |  |  |  |
Restricted Stock and Performance Units [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Unrecognized compensation expense related to stock options and restricted stock |  | $ 6,000,000.0 |  |  |
Weighted average vesting period |  | 2 years 8 months 12 days |  |  |

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- Definition The number of grants made 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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- 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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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. + 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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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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