Goodwill and Other Intangible Assets - Summary of Definite-Lived Intangible Assets Arose From OneClick and Unitron Acquisitions (Detail) - OneClick and Unitron Acquisitions [Member] - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Acquired Finite Lived Intangible Assets [Line Items] | ||
| Definite-lived intangible assets, gross | $ 1,198 | $ 1,198 |
| Less accumulated amortization | (315) | (63) |
| Total | 883 | 1,135 |
| Tradenames [Member] | ||
| Acquired Finite Lived Intangible Assets [Line Items] | ||
| Definite-lived intangible assets, gross | 938 | 938 |
| Covenants Not To Compete [Member] | ||
| Acquired Finite Lived Intangible Assets [Line Items] | ||
| Definite-lived intangible assets, gross | 258 | 258 |
| Domain Name [Member] | ||
| Acquired Finite Lived Intangible Assets [Line Items] | ||
| Definite-lived intangible assets, gross | $ 2 | $ 2 |