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Stock-based Compensation (Details Textual) (USD $)	3 Months Ended			1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2010 Incentive Compensation Plan [Member]	Jun. 30, 2010 Incentive Compensation Plan [Member] Maximum [Member]	Jun. 30, 2010 Incentive Compensation Plan [Member] Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance					1,630,000	750,000
Increase (Decrease) in Common Stock Capital Shares Reserved for Future Issuance				880,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	551,000		146,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	526,000
Employee Benefits and Share-based Compensation	$ 26,000	$ 37,000

X

- Definition

Additional number of common shares reserved for future issuance.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
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Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	instant

X

- Definition

Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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