Quarterly report pursuant to Section 13 or 15(d)

Lightbridge Corporation and Summary of Significant Accounting Policies Nature Of Operations (Narrative) (Details)

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Lightbridge Corporation and Summary of Significant Accounting Policies Nature Of Operations (Narrative) (Details) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2012
Approximations [Member]
Jun. 30, 2011
Approximations [Member]
Jun. 30, 2012
Approximations [Member]
Jun. 30, 2011
Approximations [Member]
Dec. 31, 2011
Approximations [Member]
Jun. 30, 2012
Doubleline Total Return Bond Fund [Member]
Dec. 31, 2011
Doubleline Total Return Bond Fund [Member]
Jun. 30, 2012
Vanguard Wellesley Income Fund [Member]
Dec. 31, 2011
Vanguard Wellesley Income Fund [Member]
Jun. 30, 2012
Vanguard High Yield Corp Investor Fund [Member]
Dec. 31, 2011
Vanguard High Yield Corp Investor Fund [Member]
Jun. 30, 2012
Vanguard GNMA Investor Fund [Member]
Dec. 31, 2011
Vanguard GNMA Investor Fund [Member]
Jun. 30, 2012
Vanguard Short Term Investment Grade Investor [Member]
Dec. 31, 2011
Vanguard Short Term Investment Grade Investor [Member]
Power output increase based on future potential revenues 17.00%                                    
Maximum increase in power output based on future revenue 30.00%                                    
Stock based compensation         $ 300,000 $ 300,000 $ 600,000 $ 800,000                      
Federally insured cash limit 250,000                                    
Cash and Cash Equivalents, at Carrying Value 827,486 3,569,098 1,294,332 2,373,421 800,000   800,000   3,600,000                    
Restricted Cash         800,000   800,000   600,000                    
Marketable Securities         5,000,000   5,000,000   5,200,000                    
Mutual Funds                   1,000,000 1,000,000 1,200,000 1,300,000 1,300,000 1,300,000 800,000 800,000 700,000 800,000
Unrealized Gain (Loss) on Securities         0 0 100,000 100,000                      
Cost basis of investments         4,800,000   4,800,000   5,100,000                    
Unrealized gain loss from financial institutions         100,000 100,000 200,000 200,000                      
Valuation allowance 100.00%                                    
More likely than not threshold 50.00%                                    
Research and development costs         $ 500,000 $ 500,000 $ 1,000,000 $ 1,100,000