Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Summary of Unaudited Pro Forma Combined Financial Information for Acquisition (Detail)

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Business Combinations - Summary of Unaudited Pro Forma Combined Financial Information for Acquisition (Detail) - Wazee Digital Inc [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Net revenues - pro forma combined $ 11,918 $ 8,546 $ 29,221 $ 25,394
Net loss - pro forma combined (15,792) (19,803) (42,873) (48,114)
Accretion of redeemable convertible preferred stock       (4,470)
Net loss attributable to common stockholders - pro forma combined $ (15,792) $ (19,803) $ (42,873) $ (52,584)