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Contract Assets and Contract Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue From Contract With Customer [Abstract]  
Summary of Company's Contract Asset and Contract Liability

Accounts receivable and unbilled, net consisted of the following (in thousands):

 

 

As of

 

 

December 31,

 

 

December 31,

 

 

2019

 

 

2018

 

Accounts receivable

$

127,877

 

 

$

85,120

 

Unbilled receivables

 

28,368

 

 

 

49,361

 

Less: allowance for doubtful accounts

 

(583

)

 

 

(1,032

)

           Total accounts receivable and unbilled, net

$

155,662

 

 

$

133,449

 

Advanced billings consisted of the following (in thousands):

 

 

As of

 

 

December 31,

 

 

December 31,

 

 

2019

 

 

2018

 

Advanced billings

$

192,359

 

 

$

147,935

 

 

 

 

 

 

 

 

 
Schedule of Allowance for Doubtful Account Activity

A rollforward of allowance for doubtful account activity is as follows:

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

Allowance for doubtful accounts - beginning balance

 

$

(1,032

)

 

$

(673

)

 

$

(3,222

)

Current year provision

 

 

(263

)

 

 

(791

)

 

 

(250

)

Write-offs, recoveries and the effects of foreign currency exchange

 

 

712

 

 

 

432

 

 

 

2,799

 

Allowance for doubtful accounts - ending balance

 

$

(583

)

 

$

(1,032

)

 

$

(673

)