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Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 4,438,533us-gaap_CashAndCashEquivalentsAtCarryingValue $ 7,270,301us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance of $131,898 and $131,464 in 2015 and 2014, respectively 7,736,618us-gaap_AccountsReceivableNetCurrent 6,480,499us-gaap_AccountsReceivableNetCurrent
Inventories 6,376,082us-gaap_InventoryNet 6,371,903us-gaap_InventoryNet
Prepaid expenses and other current assets 946,819us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,094,837us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 19,498,052us-gaap_AssetsCurrent 21,217,540us-gaap_AssetsCurrent
Property and equipment, net 876,882us-gaap_PropertyPlantAndEquipmentNet 894,728us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 1,304,694us-gaap_IntangibleAssetsNetExcludingGoodwill 1,379,653us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 352,867us-gaap_OtherAssetsNoncurrent 388,850us-gaap_OtherAssetsNoncurrent
Total assets 22,032,495us-gaap_Assets 23,880,771us-gaap_Assets
Current liabilities:    
Accounts payable 2,603,628us-gaap_AccountsPayableCurrent 2,353,133us-gaap_AccountsPayableCurrent
Accrued liabilities 5,241,921us-gaap_AccruedLiabilitiesCurrent 5,505,142us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 6,318,529us-gaap_DeferredRevenueCurrent 6,658,170us-gaap_DeferredRevenueCurrent
Warrants 3,026,564stxs_WarrantsAndDebtConversionFeaturesAtFairValue 2,134,187stxs_WarrantsAndDebtConversionFeaturesAtFairValue
Total current liabilities 17,190,642us-gaap_LiabilitiesCurrent 16,650,632us-gaap_LiabilitiesCurrent
Long-term debt, less current maturities 18,319,895us-gaap_LongTermDebtNoncurrent 18,388,764us-gaap_LongTermDebtNoncurrent
Long-term deferred revenue 963,356us-gaap_DeferredRevenueNoncurrent 976,165us-gaap_DeferredRevenueNoncurrent
Other liabilities 339,246us-gaap_OtherLiabilitiesNoncurrent 414,928us-gaap_OtherLiabilitiesNoncurrent
Stockholders' deficit:    
Preferred stock, par value $0.001; 10,000,000 shares authorized, none outstanding at 2015 and 2014      
Common stock, par value $0.001; 300,000,000 shares authorized, 20,911,838 and 20,480,874 shares issued at 2015 and 2014, respectively 20,912us-gaap_CommonStockValue 20,481us-gaap_CommonStockValue
Additional paid in capital 447,145,927us-gaap_AdditionalPaidInCapital 446,241,703us-gaap_AdditionalPaidInCapital
Treasury stock, 4,015 shares at 2015 and 2014 (205,999)us-gaap_TreasuryStockValue (205,999)us-gaap_TreasuryStockValue
Accumulated deficit (461,741,484)us-gaap_RetainedEarningsAccumulatedDeficit (458,605,903)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' deficit (14,780,644)us-gaap_StockholdersEquity (12,549,718)us-gaap_StockholdersEquity
Total liabilities and stockholders' deficit $ 22,032,495us-gaap_LiabilitiesAndStockholdersEquity $ 23,880,771us-gaap_LiabilitiesAndStockholdersEquity