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v3.20.1

OPERATING LEASES (Details Textual) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 13, 2016 | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Leases, Operating [Abstract] |  |  |  |
Lease expiration period | 7 years |  |  |
Area of facility | ft² |  | 1,600 |  |
Monthly lease expense |  | $ 5 |  |
Rent expense |  | $ 380 |  |
Rent expense |  |  | $ 298 | $ 308

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 Operating Lease, Monthly Lease Expense + References No definition available. + Details
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Namespace Prefix: | ams_
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Balance Type: | debit
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X
- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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

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- References No definition available. + Details
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X
- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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