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Subsequent Events (Details) (Subsequent Event)
 0 Months Ended
Apr. 07, 2015
Restricted Stock  
Subsequent Event [Line Items]  
Restricted shares issued 286,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Vesting period 3 years
Directors and Certain Employees [Member]  
Subsequent Event [Line Items]  
Shares issued 1,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= astc_DirectorsandCertainEmployeesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember