v3.20.4

Stock incentive plans - Restricted stock unit awards (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stock incentive plans |  |  |  |
Shares of common stock issued resulting from vesting |  |  | 302,000 |
RSUs |  |  |  |
Stock incentive plans |  |  |  |
Total unrecognized stock-based compensation expense | $ 9,907 |  | $ 9,907 |
Weighted average period over which unrecognized compensation expense is expected to be recognized | 1 year 8 months 12 days |  |  |
Number of Shares |  |  |  |
Non-vested at beginning of period (in shares) |  |  | 633,000 |
Granted (in shares) |  |  | 898,000 |
Vested (in shares) |  |  | (453,000) |
Canceled/forfeited (in shares) |  |  | (127,000) |
Non-vested at end of period (in shares) | 951,000 |  | 951,000 | 633,000
Weighted Average Grant Date Fair Value |  |  |  |
Non-vested at beginning of period (in dollars per share) |  |  | $ 22.04 |
Granted (in dollars per share) |  |  | 11.06 |
Vested (in dollars per share) |  |  | 18.28 |
Canceled/forfeited (in dollars per share) |  |  | 15.75 |
Non-vested at end of period (in dollars per share) | $ 14.30 |  | $ 14.30 | $ 22.04
Service based-restricted stock unit awards | Executive And Non Executive Member | Maximum |  |  |  |
Stock incentive plans |  |  |  |
Vesting period |  |  | 3 years |
Service based-restricted stock unit awards | Non-employee directors and existing members |  |  |  |
Stock incentive plans |  |  |  |
Vesting period |  |  | 1 year |
Service based-restricted stock unit awards | Non-employee directors and new members |  |  |  |
Stock incentive plans |  |  |  |
Vesting percentage when the individual completes 12 months of continuous service | 33.30% |  | 33.30% |
Vesting period |  |  | 3 years |
Performance-based restricted stock unit awards |  |  |  |
Stock incentive plans |  |  |  |
Vesting period |  |  | 3 years | 3 years
Number of Shares |  |  |  |
Granted (in shares) |  |  | 36,000 |
Weighted Average Grant Date Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 12.41 |
Performance-based restricted stock unit awards | Minimum |  |  |  |
Stock incentive plans |  |  |  |
Performance objective threshold (as a percent) | 50.00% |  | 50.00% |
Performance-based restricted stock unit awards | Maximum |  |  |  |
Stock incentive plans |  |  |  |
Performance objective threshold (as a percent) | 150.00% |  | 150.00% |
2018 performance-based RSUs |  |  |  |
Stock incentive plans |  |  |  |
Performance objective achieved (as a percent) |  | 100.50% |  |
2019 performance-based RSUs |  |  |  |
Stock incentive plans |  |  |  |
Performance objective achieved (as a percent) |  | 95.00% |  |
Number of awards excluded from granted and non-vested as the performance targets have not yet been defined | 32,000 |  | 32,000 |
2020 performance-based RSUs |  |  |  |
Stock incentive plans |  |  |  |
Performance objective achieved (as a percent) |  | 97.00% |  |
Number of awards excluded from granted and non-vested as the performance targets have not yet been defined | 151,000 |  | 151,000 |

X
- 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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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(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 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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