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PROPERTY AND EQUIPMENT - Summary of property and equipment (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Total costs | ¥ 73,975 |  | ¥ 46,265
Less: accumulated depreciation and amortization | (34,891) |  | (17,254)
Property and equipment, net | 39,084 | $ 5,614 | 29,011
Leasehold improvement |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total costs | 8,093 |  | 7,291
Motor vehicles |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total costs | 1,604 |  | 1,604
Electronic equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total costs | 56,068 |  | 29,756
Office equipment & furniture |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total costs | 6,868 |  | 6,432
Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total costs | ¥ 1,342 |  | ¥ 1,182

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