Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Cumulative amount of earnings	$ 12.0
Valuation allowance, deferred tax asset, Increase (Decrease), amount	26.8
Excess stock option benefits creditable to additional paid in capital	141.7
Interest and penalties related to uncertain tax positions	0.2
Potential benefits, which if recognized, would affect the effective tax rate.	0.4		$ 1.0
We Are Cloud, Inc
Income Tax Examination [Line Items]
Net operating loss carryforwards	3.0
FRANCE
Income Tax Examination [Line Items]
Net operating loss carryforwards	7.7
Domestic Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	342.9
Research and development credit carryforwards	5.5
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforwards	145.8
Research and development credit carryforwards	$ 6.0
Danish Tax Authority [Member]
Income Tax Examination [Line Items]
Income tax examination, settlement amount		$ 0.9