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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Capitalized research and development costs $ 66,212,000stem_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts $ 59,426,000stem_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts
Net operating losses 57,261,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 56,906,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credits 9,798,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 8,931,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Stock-based compensation 1,124,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,063,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Capital loss carryover 254,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 541,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Fixed assets 393,000us-gaap_DeferredTaxAssetsGrossNoncurrent 452,000us-gaap_DeferredTaxAssetsGrossNoncurrent
Other 3,930,000us-gaap_DeferredTaxAssetsOther 1,289,000us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 138,972,000us-gaap_DeferredTaxAssetsGross 128,608,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (138,972,000)us-gaap_DeferredTaxAssetsValuationAllowance (128,315,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets   293,000us-gaap_DeferredTaxAssetsNet
Deferred tax liability:    
Intangible assets   (293,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liability   (293,000)us-gaap_DeferredTaxLiabilities
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet