Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Below is a summary of the changes in allowance for doubtful accounts for the years ended December 31, 2017, 2016 and 2015 (in thousands):

	Balance at beginning of year		Provision, net of recoveries		Write-offs		Balance at end of year
Year ended December 31, 2017
Allowance for doubtful accounts	$	434	$	1,674	$	1,396	$	712
Year ended December 31, 2016
Allowance for doubtful accounts	$	377	$	648	$	591	$	434
Year ended December 31, 2015
Allowance for doubtful accounts	$	125	$	411	$	159	$	377

Depreciation and amortization is calculated on a straight-line basis over the estimated useful lives of those assets as follows:

Computer hardware and software	3 to 5 years
Internal-use software development costs	3 to 4 years
Furniture and fixtures	1 to 5 years
Leasehold improvements	Shorter of the estimated lease term or useful life

Select consolidated statements of operations line items, which reflect the adoption of the new standard are as follows (in thousands):

	Year ended December 31,
	2017			2016
Revenues
Software subscriptions		465,254			356,562
Other		38,363			23,874
Total revenues		503,617			380,436
Gross profit		382,346			288,225
Operating expenses
Sales and marketing		240,223			180,125
Operating loss		(5,338	)		(12,868	)
Net loss		(4,204	)		(16,225	)
Weighted-average number of shares used in computing net loss per share		76,281			72,994
Basic and diluted	$	(0.06	)	$	(0.22	)