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v3.21.1

Summary of Stock Option, Restricted Stock Award, and Restricted Stock Unit Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options and restricted stock available for grant, Beginning Balance | 11,566,000 |
Options and restricted stock available for grant, increase to pool |  | 2,214,000
Options granted | (760,000) |
Options cancelled | 1,472,000 |
Options expired | 477,000 |
Options forfeited | 133,000 |
Options and restricted stock available for grant, Ending Balance | 14,563,000 | 11,566,000
Options exercisable at December 31, 2020 | 1,934,000 |
Number of shares, Beginning Balance | 4,782,000 |
Options granted, Shares | 760,000 |
Options cancelled, Shares | (1,472,000) |
Options expired, Shares | (477,000) |
Options forfeited, Shares | (133,000) |
Number of shares, Ending Balance | 3,460,000 | 4,782,000
Weighted average exercise price, Beginning Balance | $ 4.80 |
Options granted, Weighted average exercise price | 2.29 |
Options cancelled, Weighted average exercise price | 5.81 |
Options expired, Weighted average exercise price | 5.12 |
Options forfeited, Weighted average exercise price | 3.48 |
Weighted average exercise price, Ending Balance | 3.82 | $ 4.80
Options exercisable at December 31, 2020 | $ 4.51 |
Weighted average remaining contractual term | 6 years 6 months | 5 years 9 months 25 days
Weighted average remaining contractual term, Options exercisable at December 31, 2019 | 5 years 1 month 6 days |
Aggregate intrinsic value, Outstanding | $ 27 | $ 1,585
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock granted | (560,000) |
Restricted stock forfeited | 21,000 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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