Summary of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Allowance for Doubtful Accounts

Our allowance for doubtful accounts activity is summarized as follows (in thousands):

	2017			2016			2015
Balance at January 1,
Allowance for doubtful accounts	$	78		$	268		$	291
Charges to expense		192			(115	)		116
Write-offs of uncollectible accounts, net    of recoveries		(5	)		(75	)		(139	)
Balance at December 31,
Allowance for doubtful accounts	$	265		$	78		$	268

Property Plant And Equipment Estimated Useful Life Table Text Block

Depreciation of property, equipment and software is calculated using either straight-line or accelerated methods over estimated useful lives of the related assets or lease terms, as follows:

	Years
Buildings	39
Office furniture and fixtures	7
Computer hardware and software	3-10
Leasehold improvements	Shorter of lease term or estimated useful life

Summary of Basic and Diluted Common Shares Outstanding

Basic and diluted shares outstanding are summarized as follows (in thousands):

	Year Ended
	December 31,
	2017		2016		2015
Weighted average number of basic shares outstanding		7,275		7,226		7,173
Effect of dilutive securities		276		152		180
Weighted average number of diluted shares outstanding		7,551		7,378		7,353