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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2019
Accounts Receivable Net [Abstract] |
Accounts Receivable, Net | 5. Accounts Receivable, Net The following table sets out the balance of accounts receivable as of December 31, 2018 and 2019 (in thousands):
|  | As of December 31, |
|  | 2018 |  |  | 2019 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts receivable, gross |  |  | 562,797 |  |  |  | 757,158 |  |  |  | 108,759 |
Allowance for doubtful accounts |  |  | (78,684 | ) |  |  | (118,886 | ) |  |  | (17,077 | )
Accounts receivable, net |  |  | 484,113 |  |  |  | 638,272 |  |  |  | 91,682 |
The following table presents the movement of the allowance for doubtful accounts (in thousands):
|  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Balance as of January 1, |  |  | 91,348 |  |  |  | 65,454 |  |  |  | 78,684 |  |  |  | 11,302 |
Additional provision/(reversal) charged to bad debt expenses, net |  |  | (9,137 | ) |  |  | 22,473 |  |  |  | 43,932 |  |  |  | 6,311 |
Write-off of bad debt provision |  |  | (16,757 | ) |  |  | (9,243 | ) |  |  | (3,730 | ) |  |  | (536 | )
Balance as of December 31, |  |  | 65,454 |  |  |  | 78,684 |  |  |  | 118,886 |  |  |  | 17,077 |
The reversal of RMB9.1 million bad debt expenses in 2017 were mainly caused by the collection of previously fully-reserved receivables of RMB25.4 million, and partially offset by the addition of new bad debt provision of RMB16.3 million.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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