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Stock Compensation Plans - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||
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Nov. 04, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2012
Restricted Stock [Member]
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Dec. 31, 2011
Restricted Stock [Member]
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Dec. 31, 2010
Restricted Stock [Member]
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Dec. 31, 2012
Qualified Employee Stock Purchase Plan [Member]
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Dec. 31, 2011
Qualified Employee Stock Purchase Plan [Member]
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Dec. 31, 2010
Qualified Employee Stock Purchase Plan [Member]
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Dec. 31, 2012
Plan Limit [Member]
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Dec. 31, 2012
Individual Counterparty [Member]
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Dec. 31, 2012
Plan 2009 [Member]
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Sep. 30, 2010
Plan 2009 [Member]
Restricted Stock [Member]
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Dec. 31, 2012
Plan 1999 [Member]
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Dec. 31, 2012
Employees and Director Option [Member]
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Dec. 31, 2011
Employees and Director Option [Member]
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Dec. 31, 2010
Employees and Director Option [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 8,020,743 | 10,000,000 | 200,000 | ||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date | 5.00% | 5.00% | |||||||||||||||||
| Stock Issued During Period, Shares, Share-based Compensation, Gross | 58,884 | 58,884 | 62,274 | 98,513 | |||||||||||||||
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 1.09 | $ 1.25 | $ 0.89 | ||||||||||||||||
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 2.36 | $ 1.69 | $ 1.19 | ||||||||||||||||
| Issuance of common stock | $ 795 | $ 682 | $ 773 | $ 138 | $ 843 | $ 63 | |||||||||||||
| Awards With Annual Limit | 25,000,000 | 1,500,000 | |||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 1.19 | $ 1.19 | $ 1.13 | $ 0.82 | $ 0.58 | ||||||||||||||
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 1.68 | ||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 9,531 | 9,531 | |||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | 11,055 | ||||||||||||||||||
| Unrecognized compensation cost for stock based compensation, period of recognition | 2 years 6 months | 2 years 8 months 12 days | |||||||||||||||||
| Allocated Share-based Compensation Expense | 4,690 | 3,909 | 5,411 | 54 | 105 | 28 | |||||||||||||
| Issuance of restricted stock grants, shares forfeited | 2,500 | 12,500 | 5,000 | 2,500 | |||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 4,475,000 | 4,475,000 | 4,475,000 | 5,764,000 | 0 | 192,500 | |||||||||||||
| Percentage Of Incentive and Non Qualified Options Description | The exercise price of both incentive and non-qualified options may not be less than 100% of the fair market value of LTS' common stock at the date of grant, provided, that the exercise price of an incentive stock option granted to a 10% Shareholder shall not be less than 110% of the fair market value of LTS' common stock at the date of grant. | ||||||||||||||||||
| Incentive Compensation Plan Shares Issued | 8,832,285 | 1,104,654 | |||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | $ 1,267 | $ 762 | $ 960 | ||||||||||||||||
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | 180,000 | ||||||||||||||||||