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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 1, 2018, the Company announced that it had acquired certain assets of Singapore-based 1Mobility, expanding the Company’s domain expertise in passive scanning and deep packet inspection as well as accelerating its entrance into the mitigation and response segment, natively from the Qualys cloud platform. Total purchase consideration related to the acquisition was $4.0 million in cash, of which $0.6 million is payable in the future subject to terms and conditions of the purchase agreement. The acquisition will be accounted for as a business combination.