7. Stock options and warrants (Details Narrative) (USD $)
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3 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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|
Share based compensation | $ 228,352us-gaap_ShareBasedCompensation | $ 155,378us-gaap_ShareBasedCompensation | |
Options | |||
Options outstanding |
21,761,512us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
21,052,030us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
|
Weighted average contractual life options outstanding | 6 years | ||
Fair value of options at grant date |
296,267us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
||
Aggregate intrinsic value of options outstanding |
3,517,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
||
Share based compensation |
207,425us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
107,907us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
|
Future unamortized compensation expense on unvested outstanding options |
531,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
||
Warrants | |||
Options outstanding |
5,392,087us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
||
Weighted average contractual life options outstanding | 2 years 9 months 18 days | ||
Share based compensation |
20,927us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
17,271us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
|
Aggregate intrinsic value of warrants outstanding |
577,242us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
||
Future unamortized compensation expense on unvested warrants |
25,138us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
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Warrants exercised |
200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
||
Proceeds from warrants exercised |
$ 50,000us-gaap_ProceedsFromWarrantExercises / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
||
Warrants expired |
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations / us-gaap_AwardTypeAxis = us-gaap_WarrantMember |
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2004 Stock Option Plan | |||
Options outstanding |
5,001,482us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = zero_StockPlanMember |
4,292,030us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = zero_StockPlanMember |
|
Option shares available for grant |
730,185us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = zero_StockPlanMember |
1,439,637us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = zero_StockPlanMember |
|
Options granted |
738,522us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = zero_StockPlanMember |
||
Options forfeited |
29,070us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = zero_StockPlanMember |
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Outside the Plan | |||
Options outstanding |
16,760,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = zero_OutsideThePlanMember |
16,760,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = zero_OutsideThePlanMember |
|
Options granted |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = zero_OutsideThePlanMember |
X | ||||||||||
- Definition
Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. No definition available.
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X | ||||||||||
- Definition
Unrecognized cost of unvested options awarded to employees as compensation. No definition available.
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X | ||||||||||
- Definition
The cash inflow associated with the amount received from holders exercising their stock warrants. No definition available.
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X | ||||||||||
- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. No definition available.
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X | ||||||||||
- Definition
Number of non-option equity instruments exercised by participants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
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