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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Income Taxes  
Deferred tax assets, net of valuation allowance 0us-gaap_DeferredTaxAssetsNet
United States  
Valuation allowance  
Period of cumulative loss position 3 years
Percentage of valuation allowance 100.00%acls_DeferredTaxAssetsValuationAllowancePercentage
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember