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Business Combinations - Summary of Unaudited Pro Forma Combined Results of Operations (Details) - IDV Solutions LLC
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue, pro forma $ 104,889
Net loss, pro forma $ (19,779)
Basic and diluted earnings per share pro forma | $ / shares $ (0.71)