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Description of Operations and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Description Of Operations And Summary Of Significant Accounting Policies [Abstract]  
Summary of Activity within Allowance for Doubtful Accounts

Activity within the allowance for doubtful accounts was as follows (in thousands):

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

 

$

122

 

 

$

289

 

 

$

450

 

Charges, net of reversals

 

 

291

 

 

 

(93

)

 

 

(3

)

Write-offs

 

 

—

 

 

 

(74

)

 

 

(158

)

Balance at end of period

 

$

413

 

 

$

122

 

 

$

289

 

 
Property and Equipment Estimated Useful Lives

Property and equipment are recorded at cost and depreciated over their estimated useful lives using the straight-line method and the following estimated useful lives:

 

Computer and office equipment

 

2-3 years

Software

 

1-3 years

Furniture

 

3 years