Share-based Compensation Stock Option Plan Additional Information (Details)	9 Months Ended
Sep. 30, 2014 optionplans
Stock Option Plan Additional Information [Abstract]
Number of option plans	2
Percentage of fair market value	110.00%
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.

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