Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Allowance for Doubtful Accounts

allowance for doubtful accounts consists of the following activity (in thousands):

	Year Ended December 31,
	2017			2016
Allowance for doubtful accounts, beginning balance	$	1,269		$	763
Additions	3,400			2,029
Write-offs	(3,417		)	(1,523		)
Allowance for doubtful accounts, ending balance	$	1,252		$	1,269

Schedule of Property Plant and Equipment Estimated Useful Lives Table [Table Text Block]

The estimated useful lives of our property and equipment are as follows:

Furniture and fixtures	5 years
Hosting equipment	3 years
Computer equipment and licensed software and patents	3 to 5 years
Leasehold improvements	Shorter of the lease term or estimated useful life

Summary of Income Statement Balance Sheet Items, After Adoption Of New Accounting Standards [Table Text Block]

Selected consolidated statement of operations line items, which have been restated to reflect the adoption of the new standard, are as follows (in thousands):

	Year ended December 31,
	2017		2016
Revenue	430,165		312,844
Operating expenses:
Sales and marketing	211,918		161,653
Operating loss	(106,146	)	(98,147	)
Net loss	(102,141	)	(97,620	)

Selected consolidated balance sheet line items, which have been restated to reflect the adoption of the new standard, are as follows (in thousands):

	December 31, 2017
Assets
Deferred costs	15,771
Deferred costs, noncurrent	15,395
Liabilities and stockholders’ equity
Deferred revenue	173,147
Deferred revenue, noncurrent	1,213
Accumulated deficit	(398,043	)