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Segment Information - Schedule of Total Revenue Based on Customer's Location (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Total revenue $ 179,507us-gaap_Revenues $ 141,738us-gaap_Revenues $ 120,066us-gaap_Revenues
United States      
Segment Reporting Information [Line Items]      
Total revenue 85,325us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
68,127us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
43,389us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Japan      
Segment Reporting Information [Line Items]      
Total revenue 45,787us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP
39,581us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP
58,653us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP
Asia Pacific, excluding Japan      
Segment Reporting Information [Line Items]      
Total revenue 20,434us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
15,052us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
10,315us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
EMEA      
Segment Reporting Information [Line Items]      
Total revenue 19,254us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
12,087us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
6,469us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Other      
Segment Reporting Information [Line Items]      
Total revenue $ 8,707us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= aten_OtherCountriesMember
$ 6,891us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= aten_OtherCountriesMember
$ 1,240us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= aten_OtherCountriesMember