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Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest (Details) (Restricted Stock Units [Member]) | 12 Months Ended
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Dec. 31, 2012
Restricted Stock Units [Member] |
Restricted stock units scheduled for vesting in the second year | 28,739
Restricted stock units scheduled for vesting in the third year | 14,293
Restricted stock units scheduled for vesting in the fourth year | 0
Restricted stock units scheduled for vesting thereafter | 0
Total outstanding restricted stock units scheduled to vest | 43,032

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- Definition Restricted stock units scheduled for vesting in the fourth year + References No definition available. + Details
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Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock units scheduled for vesting in the second year + References No definition available. + Details
Name: | ltbr_RestrictedStockUnitsScheduledForVestingInTheSecondYear
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock units scheduled for vesting in the third year + References No definition available. + Details
Name: | ltbr_RestrictedStockUnitsScheduledForVestingInTheThirdYear
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock units scheduled for vesting thereafter + References No definition available. + Details
Name: | ltbr_RestrictedStockUnitsScheduledForVestingThereafter
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Total outstanding restricted stock units scheduled to vest + References No definition available. + Details
Name: | ltbr_TotalOutstandingRestrictedStockUnitsScheduledToVest
Namespace Prefix: | ltbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration