v3.19.1

Acquisition of OneClick - Summary of Unaudited Pro Forma Condensed Combined Statement of Operations (Paranthetical) (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Cost of sales |  | $ 19,128,000 | $ 12,235,000
Effect of Change [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cost of sales | $ 904,000 |  | $ 904,000
Operating expenses | $ (904,000) |  |

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