XML 38 R25.htm IDEA: XBRL DOCUMENT
v3.19.1

Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Stockholders Equity And Stock-based Compensation |
Schedule of Warrants Outstanding |
|  | December 31, |  |  | December 31, |
Outstanding Warrants |  | 2018 |  |  | 2017 |
Issued to Investors on October 25, 2013, entitling the holders to purchase 250,000 common shares in the Company at an exercise price of $11.50 per common share up to and including April 24, 2021. In 2016, 59,450 of these warrants were exchanged for common stock, and all remaining warrant holders agreed to new warrant terms, which excluded any potential net cash settlement provisions in exchange for a reduced exercise price of $6.25 per share. |  |  | 163,986 |  |  |  | 163,986 |
Issued to Investors on November 17, 2014, entitling the holders to purchase 546,919 common shares in the Company at an exercise price of $11.55 per common share up to and including May 16, 2022. On June 30, 2016, the warrant holders agreed to new warrant terms, which excluded any potential net cash settlement provisions in order to classify them as equity in exchange for a reduced exercise price of $6.25 per share. |  |  | 546,919 |  |  |  | 546,919 |
Issued to an investor on August 10, 2016, entitling the holders to purchase 500,000 common shares in the Company at an exercise price of price of $0.01 per share, up to and including December 31, 2019. These warrants were exercised in January 2018. |  |  | — |  |  |  | 500,000 |
Issued to an investment bank and subsequently transferred to a principal of the investment bank regarding the Series B Preferred Stock investment on January 30, 2018, entitling the holder to purchase 133,432 common shares in the Company at an exercise price of $1.50 per share, up to and including January 30, 2021. |  |  | 133,432 |  |  |  | — |
Total |  |  | 844,337 |  |  |  | 1,210,905 |
Schedule of Share-based Compensation, Stock Options, Activity |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |
Research and development expenses |  | $ | 965,617 |  |  | $ | 504,913 |
General and administrative expenses |  |  | 1,414,288 |  |  |  | 688,393 |
Total stock-based compensation expense |  | $ | 2,379,905 |  |  | $ | 1,193,306 |
Schedule of weighted average years remaining of expected life activity |
Expected volatility |  |  | 90 | %
Risk free interest rate |  |  | 2.84 | %
Dividend yield rate |  |  | 0 | %
Weighted average years |  | 9.8 months |
Closing price per share – common stock |  | $ | 0.88 |
Schedule of Stock option transactions of the employees | Stock option transactions of the employees, directors, and consultants are summarized as follows for the year ended December 31, 2018:
|  | Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |
Beginning of the year |  |  | 3,976,884 |  |  | $ | 3.58 |  |  | $ | 2.49 |
Granted |  |  | 1,784,455 |  |  |  | 0.90 |  |  |  | 0.70 |
Exercised |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | (143,980 | ) |  |  | 1.10 |  |  |  | 0.83 |
Expired |  |  | (13,205 | ) |  |  | 30.60 |  |  |  | 21.13 |
End of the year |  |  | 5,604,154 |  |  | $ | 2.72 |  |  | $ | 1.96 |
Options exercisable |  |  | 3,935,138 |  |  | $ | 3.50 |  |  | $ | 2.49 |
Stock option transactions of the employees, directors, and consultants are summarized as follows for the year ended December 31, 2017:
|  | Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |
Beginning of the year |  |  | 2,172,581 |  |  | $ | 6.70 |  |  | $ | 4.83 |
Granted |  |  | 1,854,277 |  |  |  | 1.05 |  |  |  | 0.77 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | (49,974 | ) |  |  | 45.53 |  |  |  | 38.70 |
End of the year |  |  | 3,976,884 |  |  | $ | 3.58 |  |  | $ | 2.49 |
Options exercisable |  |  | 2,434,148 |  |  | $ | 4.84 |  |  | $ | 3.36 |
Schedule of Non-Vested Options, Activity |
|  | Shares |  |  | Weighted- Average Fair Value Grant Date |  |  | Weighted Average Exercise Price |
Non-vested – December 31, 2016 |  |  | 450,476 |  |  | $ | 3.60 |  |  | $ | 5.40 |
Granted |  |  | 1,854,277 |  |  |  | 0.77 |  |  |  | 1.05 |
Vested |  |  | (762,017 | ) |  |  | 1.67 |  |  |  | 2.54 |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |
Non-vested – December 31, 2017 |  |  | 1,542,736 |  |  | $ | 1.10 |  |  | $ | 1.58 |
Granted |  |  | 1,784,455 |  |  |  | 0.70 |  |  |  | 0.90 |
Vested |  |  | (1,514,195 | ) |  | $ | 1.27 |  |  | $ | 1.58 |
Forfeited |  |  | (143,980 | ) |  |  | 0.83 |  |  |  | 1.10 |
Non-vested – December 31, 2018 |  |  | 1,669,016 |  |  | $ | 0.54 |  |  | $ | 0.91 |
Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | The following table provides certain information with respect to the above-referenced stock options that were outstanding and exercisable at December 31, 2018:
|  |  | Stock Options Outstanding |  |  | Stock Options Vested |
|  |  | Weighted |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |
|  |  | Average |  |  |  |  |  |  |  |  | Average |  |  |  |  |  |  |
|  |  | Remaining |  |  |  |  |  | Weighted |  |  | Remaining |  |  |  |  |  | Weighted |
|  |  | Contractual |  |  | Number |  |  | Average |  |  | Contractual |  |  | Number |  |  | Average |
|  |  | Life |  |  | of |  |  | Exercise |  |  | Life |  |  | of |  |  | Exercise |
| Exercise Prices |  | -Years |  |  | Awards |  |  | Price |  |  | -Years |  |  | Awards |  |  | Price |
$ | 0.90-$1.04 |  |  | 9.60 |  |  |  | 1,616,402 |  |  | $ | 0.90 |  |  |  | — |  |  |  | 0 |  |  | $ | — |
$ | 1.05-$2.00 |  |  | 8.57 |  |  |  | 2,560,330 |  |  | $ | 1.18 |  |  |  | 8.56 |  |  |  | 2,507,716 |  |  | $ | 1.18 |
$ | 2.01-$6.00 |  |  | 6.86 |  |  |  | 813,583 |  |  | $ | 4.59 |  |  |  | 6.86 |  |  |  | 813,583 |  |  | $ | 4.59 |
$ | 6.01-$20.00 |  |  | 4.16 |  |  |  | 501,334 |  |  | $ | 7.48 |  |  |  | 4.16 |  |  |  | 501,334 |  |  | $ | 7.48 |
$ | 20.01-$43.25 |  |  | 0.72 |  |  |  | 112,505 |  |  | $ | 29.46 |  |  |  | 0.72 |  |  |  | 112,505 |  |  | $ | 29.46 |
| Total |  |  | 8.07 |  |  |  | 5,604,154 |  |  | $ | 2.72 |  |  |  | 7.42 |  |  |  | 3,935,138 |  |  | $ | 3.50 |
The following table provides certain information with respect to the above-referenced stock options that were outstanding and exercisable at December 31, 2017:
|  |  | Stock Options Outstanding |  |  | Stock Options Vested |
|  |  | Weighted |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |
|  |  | Average |  |  |  |  |  |  |  |  | Average |  |  |  |  |  |  |
|  |  | Remaining |  |  |  |  |  | Weighted |  |  | Remaining |  |  |  |  |  | Weighted |
|  |  | Contractual |  |  | Number |  |  | Average |  |  | Contractual |  |  | Number |  |  | Average |
|  |  | Life |  |  | of |  |  | Exercise |  |  | Life |  |  | of |  |  | Exercise |
Exercise Prices |  | -Years |  |  | Awards |  |  | Price |  |  | -Years |  |  | Awards |  |  | Price |
$ | 1.05-$2.00 |  |  | 9.56 |  |  |  | 2,528,666 |  |  | $ | 1.18 |  |  |  | 9.28 |  |  |  | 1,197,708 |  |  | $ | 1.33 |
$ | 2.01-$6.00 |  |  | 7.86 |  |  |  | 821,174 |  |  | $ | 4.59 |  |  |  | 7.86 |  |  |  | 651,429 |  |  | $ | 4.58 |
$ | 6.01-$20.00 |  |  | 5.12 |  |  |  | 505,694 |  |  | $ | 7.47 |  |  |  | 4.93 |  |  |  | 463,661 |  |  | $ | 7.58 |
$ | 20.01-$45.00 |  |  | 1.66 |  |  |  | 118,016 |  |  | $ | 29.85 |  |  |  | 1.66 |  |  |  | 118,016 |  |  | $ | 29.85 |
$ | 45.01-$72.00 |  |  | 0.18 |  |  |  | 3,334 |  |  | $ | 50.25 |  |  |  | 0.18 |  |  |  | 3,334 |  |  | $ | 50.25 |
| Total |  |  | 8.40 |  |  |  | 3,976,884 |  |  | $ | 3.58 |  |  |  | 7.70 |  |  |  | 2,434,148 |  |  | $ | 4.84 |
Schedule of Service-based Payment Award, Stock Options, Valuation Assumptions | Weighted average assumptions used in the Black Scholes option-pricing model for the years ended December 31, 2018 and 2017, were as follows:
|  | Year ended |  |  | Year ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Average risk-free interest rate |  |  | 2.79 | % |  |  | 2.15 | %
Average expected life- years |  |  | 6.0 |  |  |  | 5.67 |
Expected volatility |  |  | 90.11 | % |  |  | 87.24 | %
Expected dividends |  |  | 0.0 | % |  |  | 0.0 | %
In accordance with ASC 718, the market-based and performance-based long-term non-qualified option grants awards issued in 2017 were assigned a fair value of $0.80 per option share (total value of $0.9 million) on the date of grant using a Monte Carlo simulation. The following assumptions were used in the Monte Carlo simulation model:
Expected volatility |  | 87.5% to 91 | %
Risk free interest rate |  | 2.24% to 2.42 |
Dividend yield rate |  |  | 0 | %
Weighted average remaining expected life |  | 4.2 years |
Closing price per share – common stock |  | $ | 1.05 |

X
- Definition Schedule of Non-Vested Shares, Activity [Table Text Block] + References No definition available. + Details
Name: | ltbr_ScheduleOfNonvestedSharesActivityTableTextBlock
Namespace Prefix: | ltbr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ltbr_ScheduleOfStockOptionTransactionsOfEmployeesTableTextBlock
Namespace Prefix: | ltbr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ltbr_ScheduleOfWeightedAverageYearsRemainingOfExpectedLifeTableTextBlock
Namespace Prefix: | ltbr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
Name: | us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration