XML 16 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9
Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Jan. 16, 2015
sqft
May 01, 2017
sqft
Sep. 01, 2016
sqft
Schedule Of Operating Leases Square Footage [Line Items]      
Lease square footage 222,000amsg_OperatingLeasesAreaOfOfficeSpace    
Annual rent expense $ 2.7amsg_OperatingLeasesRentExpensePerYear    
Scenario, Forecast [Member]      
Schedule Of Operating Leases Square Footage [Line Items]      
Lease square footage   55,000amsg_OperatingLeasesAreaOfOfficeSpace
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 167,000amsg_OperatingLeasesAreaOfOfficeSpace
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember