XML 66 R52.htm IDEA: XBRL DOCUMENT
v3.21.1

Stockholders Equity and StockBased Compensation (Details 6) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Weighted Average Remaining Contractual Life - Years | 6 years 11 months 4 days | 9 years 2 months 19 days
Number of Awards Stock option outstanding | 515,847 | 518,551
Weighted Average Exercise Price Stock Options Outstanding | $ 20.32 | $ 21.99
Number of Awards Vested | 466,121 | 433,678
Weighted Average Exercise Price | $ 21.35 | $ 24.19
Weighted Average Remaining Contractual Life of Stock Options Vested | 6 years 9 months 25 days | 7 years 8 months 26 days
Range One [Member] |  |
Weighted Average Remaining Contractual Life - Years | 8 years 1 month 27 days | 9 years 2 months 19 days
Number of Awards Stock option outstanding | 225,179 | 225,937
Weighted Average Exercise Price Stock Options Outstanding | $ 8.04 | $ 8.07
Number of Awards Vested | 176,332 | 143,696
Weighted Average Exercise Price | $ 7.60 | $ 6.57
Weighted Average Remaining Contractual Life of Stock Options Vested | 8 years 2 months 15 days | 9 years 4 months 24 days
Exercise price lower range limit | $ 3.82 | $ 3.82
Exercise price upper range limit | $ 12.48 | $ 12.48
Range Two [Member] |  |
Weighted Average Remaining Contractual Life - Years | 6 years 6 months 25 days | 7 years 6 months 25 days
Number of Awards Stock option outstanding | 199,790 | 199,790
Weighted Average Exercise Price Stock Options Outstanding | $ 14.19 | $ 14.19
Number of Awards Vested | 198,911 | 197,158
Weighted Average Exercise Price | $ 14.20 | $ 14.21
Weighted Average Remaining Contractual Life of Stock Options Vested | 6 years 6 months 21 days | 7 years 6 months 21 days
Exercise price lower range limit | $ 12.49 | $ 12.49
Exercise price upper range limit | $ 24.00 | $ 24.00
Range Three [Member] |  |
Weighted Average Remaining Contractual Life - Years | 4 years 10 months 20 days | 5 years 10 months 20 days
Number of Awards Stock option outstanding | 65,333 | 65,333
Weighted Average Exercise Price Stock Options Outstanding | $ 55.07 | $ 55.07
Number of Awards Vested | 65,333 | 65,333
Weighted Average Exercise Price | $ 55.07 | $ 55.07
Weighted Average Remaining Contractual Life of Stock Options Vested | 4 years 10 months 20 days | 5 years 10 months 20 days
Exercise price lower range limit | $ 24.01 | $ 24.01
Exercise price upper range limit | $ 72.00 | $ 72.00
Range Four [Member] |  |
Weighted Average Remaining Contractual Life - Years | 4 years 3 months 25 days | 5 years 3 months 25 days
Number of Awards Stock option outstanding | 24,526 | 24,526
Weighted Average Exercise Price Stock Options Outstanding | $ 75.59 | $ 75.59
Number of Awards Vested | 24,526 | 24,526
Weighted Average Exercise Price | $ 75.59 | $ 75.59
Weighted Average Remaining Contractual Life of Stock Options Vested | 4 years 3 months 25 days | 5 years 3 months 25 days
Exercise price lower range limit | $ 72.01 | $ 72.01
Exercise price upper range limit | $ 240.00 | $ 240.00
Range Five [Member] |  |
Weighted Average Remaining Contractual Life - Years | 2 months 23 days | 7 months 17 days
Number of Awards Stock option outstanding | 1,019 | 2,965
Weighted Average Exercise Price Stock Options Outstanding | $ 329.81 | $ 435.67
Number of Awards Vested | 1,019 | 2,965
Weighted Average Exercise Price | $ 329.81 | $ 435.67
Weighted Average Remaining Contractual Life of Stock Options Vested | 2 months 23 days | 7 months 17 days
Exercise price lower range limit | $ 240.01 | $ 240.01
Exercise price upper range limit | $ 331.80 | $ 519.00

X
- References No definition available. + Details
Name: | ltbr_NumberOfAwardsStockOptionOutstanding
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ltbr_NumberOfAwardsVested
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ltbr_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm
Namespace Prefix: | ltbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ltbr_RangeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ltbr_RangeTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ltbr_RangeThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ltbr_RangeFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ltbr_RangeFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |