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OPERATING LEASES (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 13, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2013
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Rent Expense |  | $ 298,000 | $ 308,000 | $ 307,000 |
Operating Leases Cumulative Loss |  |  |  |  | $ 115,000
Operating Leases, Rent Expense, Net |  | $ 0 | $ 0 | $ 76,000 |
Lease Expiration Period | 7 years |  |  |  |

X
- Definition Period on which lease or group of leases is set to expire. + References No definition available. + Details
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X
- Definition Amount of cumulative loss due to subleased. + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- 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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X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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