Accounts Receivable, Net - Schedule of Analysis of Allowance for Doubtful Accounts (Detail) ¥ in Thousands, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
CNY (¥)
|
|
| Receivables [Abstract] | |||
| Beginning balance | ¥ 512 | $ 79 | ¥ 2,315 |
| Additions charged to bad debt expense | 1,854 | 284 | 2,792 |
| Reversal | (744) | (114) | (489) |
| Write off | (214) | (33) | (4,106) |
| Ending balance | ¥ 1,408 | $ 216 | ¥ 512 |