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v2.4.1.9

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

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