Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Changes in Allowance for Doubtful Accounts

The following are changes in the allowance for doubtful accounts during 2016, 2015 and 2014, respectively.

	Years Ended December 31,
	2016			2015			2014
Balances at beginning of year	$	2,188		$	989		$	417
Additions to expense or against goodwill		2,328			1,652			821
Write-offs and other deductions		(1,006	)		(453	)		(249	)
Balances at end of year	$	3,510		$	2,188		$	989

Schedule of Useful Lives of Property and Equipment

The useful lives of the property and equipment are as follows:

Computer equipment	3 to 5 years
Office equipment, furniture and fixtures	3 to 5 years
Software	3 years
Leasehold improvements	Shorter of useful life or lease term