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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Changes in Allowance for Doubtful Accounts

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

 

 

 

Year Ended December 31,

 

 

 

2015

 

 

2016

 

 

2017

 

Beginning balance

 

$

172

 

 

$

686

 

 

$

2,574

 

Add: bad debt expense

 

 

542

 

 

 

1,890

 

 

 

4,289

 

Less: write-offs, net of recoveries

 

 

(28

)

 

 

(2

)

 

 

(4,606

)

Ending balance

 

$

686

 

 

$

2,574

 

 

$

2,257

 

 
Schedule of Useful lives of PPE

Depreciation is computed using the straight-line method based upon the following estimated useful lives:

 

 

 

Years

 

Computer equipment

 

 

2

 

Purchased software

 

 

5

 

Furniture, fixtures and office equipment

 

 

5

 

Leasehold improvements

 

*

 

 

 

*

Leasehold improvements are amortized on a straight-line basis over the term of the lease, or the useful life of the assets, whichever is shorter.