Stock based Compensation and Stock Option Plan Stock Option Plan Additional Information (Details)	9 Months Ended
Sep. 30, 2012 optionplans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Optin Plans	2
Percentage of Fair Market Value	110.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Contractual Term	10 years

Share-based Compensation Arrangement by Share-based Payment Award, Specific Employee Grants, Award Exercise Price as Percentage of Market Value

No definition available.

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Namespace Prefix:	spir_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant