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

12 Months Ended

Dec. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Allowance for Doubtful Accounts

The following table presents the changes in the allowance for doubtful accounts (in thousands):



	Year Ended December 31,
	2016			2015			2014
Balance, beginning of period	$	15		$	65		$	42
Add: bad debt expense	75			171			76
Less: write-offs, net of recoveries	(78		)	(221		)	(53		)
Balance, end of period	$	12		$	15		$	65

Schedule of Property and Equipment, Useful Lives

Property and equipment is stated at cost less accumulated depreciation and amortization, and is depreciated using the straight-line method over the estimated useful lives of the assets as follows:



Asset Category		Estimated Useful Lives
Computer and network equipment		3 years
Computer software		3 years
Development costs		1 to 5 years
Furniture and fixtures		7 years
Leasehold improvements		Shorter of useful life or lease term

Property and equipment, net consisted of the following (in thousands):



	December 31,
	2016			2015
Computer and network equipment	$	37,664		$	30,277
Computer software	5,133			3,566
Internal-use software development costs	475			128
Furniture and fixtures	1,130			1,113
Leasehold improvements	624			619
Property and equipment	45,026			35,703
Accumulated depreciation and amortization	(30,338		)	(22,478		)
Property and equipment, net	$	14,688		$	13,225