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4. Significant accounting policies - Fixed Assets Depreciation(Details)
 3 Months Ended
Mar. 31, 2015
Computer Equipment  
Fixed Assets, Depreciation Rate 30.00%GRST_FixedAssetsDepreciationRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Computer Software  
Fixed Assets, Depreciation Rate 100.00%GRST_FixedAssetsDepreciationRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Furniture and Equipment  
Fixed Assets, Depreciation Rate 30.00%GRST_FixedAssetsDepreciationRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Medical Equipment  
Fixed Assets, Depreciation Rate 25.00%GRST_FixedAssetsDepreciationRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Vehicles  
Fixed Assets, Depreciation Rate 30.00%GRST_FixedAssetsDepreciationRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember