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Summary of Significant Accounting Policies and Basis of Presentation (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Contract with Client Balances
As of December 31, 2018 and December 31, 2017, we had the following balances (in thousands) included in our Consolidated Balance Sheets that relate to contracts with our clients.
 
12/31/2018
12/31/2017
Change
Contract receivables from billed revenue
$
43,878

$
36,058

$
7,820

Contract receivables from unbilled revenue
2,987

2,709

278

Deferred revenue
(2,428
)
(1,431
)
(997
)
Refund liabilities
6,497

7,864

(1,367
)