Annual report pursuant to Section 13 and 15(d)

Income taxes - Schedule of Deferred Tax Assets (Details)

v2.4.1.9
Income taxes - Schedule of Deferred Tax Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 6,356us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 4,850us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses and other 1,051tcgn_DeferredTaxAssetTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesAndOther 598tcgn_DeferredTaxAssetTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesAndOther
Accounts receivable 19us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 40us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory 207us-gaap_DeferredTaxAssetsInventory 117us-gaap_DeferredTaxAssetsInventory
Property, plant and equipment 138us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 155us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred tax assets 7,771us-gaap_DeferredTaxAssetsGross 5,760us-gaap_DeferredTaxAssetsGross
Valuation allowance (7,771)us-gaap_DeferredTaxAssetsValuationAllowance (5,760)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet