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) | ||