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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of condensed financial statement balances and amounts of Company's VIEs (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Cash and cash equivalents | ¥ 122,149 |  | ¥ 41,441 | ¥ 606,097 | $ 17,546
Restricted cash | 0 |  | 41,500 |  |
Amounts due from related parties | 130,722 |  |  |  | 18,777
Accounts receivable, net | 139,164 |  | 336,849 |  | 19,990
Contract assets, net |  |  | 203,080 |  |
Assets from the investor assurance program, net |  |  | 5,525 | 270,276 |
Prepaid expenses and other current assets | 91,002 |  | 88,234 |  | 13,072
Deferred tax assets | 68,292 |  | 56,027 |  | 9,810
Property and equipment | 39,084 |  | 29,011 |  | 5,614
Right-of-use assets | 37,215 |  |  |  | 5,346
Other long-term assets |  |  | 212 |  |
TOTAL ASSETS | 701,072 |  | 801,879 |  | 100,705
Payroll and welfare payables | 48,524 |  | 110,562 |  | 6,970
Amounts due to related parties | 872 |  | 84,509 |  | 125
Liabilities from the investor assurance program |  |  | 1,547,072 | 3,718,352 |
Refund liabilities | 180,104 |  | 84,498 |  | 25,870
Other guarantee liabilities |  |  | 4,060 |  |
Tax payables | 179,421 |  | 422,177 |  | 25,772
Accrued expenses and other current liabilities | 158,705 |  | 201,007 |  | 22,800
Other payable related to the disposal of Shanghai Caiyin | 839,830 |  |  |  | 120,634
Lease liabilities | 35,215 |  |  |  | 5,058
TOTAL LIABILITIES | 1,442,671 |  | 2,453,885 |  | $ 207,229
Net revenue | 2,230,176 | $ 320,345 | 2,881,940 | 2,250,850 |
Operating income | 534,669 | 76,799 | 685,206 | 686,661 |
Net income | 527,747 | 75,805 | 611,758 | 539,545 |
Net cash provided by (used in) operating activities | 26,291 | 3,777 | (228,368) | 104,752 |
Net cash provided by (used in) investing activities | (234,178) | (33,638) | (16,423) | 61,215 |
Net cash provided by (used in) financing activities | 244,674 | $ 35,145 | (433,600) | 13,876 |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Cash and cash equivalents | 54,602 |  | 41,441 |  |
Restricted cash |  |  | 41,500 |  |
Amounts due from related parties | 1,651 |  |  |  |
Accounts receivable, net | 110,219 |  | 336,849 |  |
Contract assets, net |  |  | 203,080 |  |
Assets from the investor assurance program, net |  |  | 5,525 |  |
Prepaid expenses and other current assets | 66,722 |  | 88,234 |  |
Deferred tax assets | 54,973 |  | 56,027 |  |
Property and equipment | 38,303 |  | 29,011 |  |
Right-of-use assets | 36,534 |  |  |  |
Other long-term assets |  |  | 212 |  |
TOTAL ASSETS | 363,004 |  | 801,879 |  |
Payroll and welfare payables | 29,386 |  | 110,562 |  |
Amounts due to related parties | 722 |  | 84,509 |  |
Liabilities from the investor assurance program |  |  | 1,547,072 |  |
Other guarantee liabilities |  |  | 4,060 |  |
Tax payables | 164,444 |  | 422,177 |  |
Accrued expenses and other current liabilities | 121,319 |  | 201,007 |  |
Other payable related to the disposal of Shanghai Caiyin | 839,830 |  |  |  |
Lease liabilities | 34,620 |  |  |  |
TOTAL LIABILITIES | 1,370,425 |  | 2,453,885 |  |
Net revenue | 2,151,165 |  | 2,881,940 | 2,250,850 |
Operating income | 583,741 |  | 685,206 | 686,661 |
Net income | 571,227 |  | 611,758 | 539,545 |
Net cash provided by (used in) operating activities | 19,465 |  | (228,368) | 104,752 |
Net cash provided by (used in) investing activities | (35,505) |  | (16,423) | 61,215 |
Net cash provided by (used in) financing activities | ¥ (12,299) |  | ¥ (433,600) | ¥ 13,876 |

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