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INVESTMENT IN EQUITY SECURITIES (Details Textual) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 05, 2007 | Apr. 10, 2006 | Jan. 31, 2012 | Oct. 31, 2008 | Dec. 31, 2013 | Jun. 30, 2013
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |
Cost Method Investments | $ 2,709,000 us-gaap_CostMethodInvestments |  |  |  |  | $ 2,701,000 us-gaap_CostMethodInvestments |
Investment Percentage in Common Stock | 0.77%ams_InvestmentPercentageInCommonStock |  |  |  |  |  |
Unrealized Gain (Loss) on Investments | 2,400,000 us-gaap_UnrealizedGainLossOnInvestments |  |  |  |  |  |
Additional Cost Method Investments |  |  |  | 70,000 ams_AdditionalCostMethodInvestments |  |  |
Stockholders' Equity, Reverse Stock Split | In mid-2011, Mevion performed a reverse stock split of all shares in which 100 shares were converted to one share. |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  | 588,000 us-gaap_ConversionOfStockSharesIssued1 / us-gaap_StatementClassOfStockAxis = ams_SeriesBConvertiblePreferredStockMember | 2,353,000 us-gaap_ConversionOfStockSharesIssued1 / us-gaap_StatementClassOfStockAxis = ams_SeriesBConvertiblePreferredStockMember |  |  |  |
Mevion Medical Systems Inc [Member] |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |
Cost Method Investments | 10,000,000 us-gaap_CostMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember | 617,000 us-gaap_CostMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember | 2,000,000 us-gaap_CostMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember | 45,000,000 us-gaap_CostMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember |  |  | 55,000,000 us-gaap_CostMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember
Initially Funded Percentage |  |  |  | 55.00%ams_InitiallyFundedPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember |  |  |
Remaining Funded Percentage |  |  |  | 45.00%ams_RemainingFundedPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember |  |  |
Proceeds from Sale of Other Investments |  |  |  |  | $ 65,000,000 us-gaap_ProceedsFromSaleOfOtherInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ams_MevionMedicalSystemsIncMember |  |

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