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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	$ 2,709,000us-gaap_CostMethodInvestments					$ 2,701,000us-gaap_CostMethodInvestments
Investment Percentage in Common Stock	0.77%ams_InvestmentPercentageInCommonStock
Unrealized Gain (Loss) on Investments	2,400,000us-gaap_UnrealizedGainLossOnInvestments
Additional Cost Method Investments				70,000ams_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	2,353,000
Mevion Medical Systems Inc [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	10,000,000	617,000	2,000,000	45,000,000			55,000,000
Initially Funded Percentage				55.00%
Remaining Funded Percentage				45.00%
Proceeds from Sale of Other Investments					$ 65,000,000