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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 96,941 | $ 100,702
Accumulated depreciation | (55,461) | (54,008)
Net property and equipment | 41,480 | 46,694
Medical equipment and facilities |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 92,132 | 94,031
Office equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 594 | 589
Deposits and construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 1,965 | 3,832
Deposits towards purchase of proton beam systems |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 2,250 | $ 2,250

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- Definition Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, Before Accumulated Depreciation And Amortization + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ams_DepositsTowardsPurchaseOfProtonBeamSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |