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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for doubtful accounts | $ 6,529,000 | $ 1,375,000
Current liabilities | $ 278,103,000 | $ 208,775,000
Ordinary shares, par value (in dollars per share) | $ 0.00025 | $ 0.00025
Ordinary shares, shares authorized | 2,400,000 | 2,400,000
Ordinary shares, shares issued | 218,076 | 212,177
Ordinary shares, shares outstanding | 218,076 | 212,177
Class A ordinary shares |  |
Ordinary shares, shares authorized | 1,800,000 | 1,800,000
Ordinary shares, shares issued | 109,155 |
Ordinary shares, shares outstanding | 109,155 |
Class B ordinary shares |  |
Ordinary shares, shares authorized | 200,000 | 200,000
Ordinary shares, shares issued | 108,921 |
Ordinary shares, shares outstanding | 108,921 |
Ordinary shares to be designated |  |
Ordinary shares, shares authorized | 400,000 | 400,000
Consolidated VIEs without recourse to the primary beneficiaries |  |
Current liabilities | $ 137,256,000 | $ 107,389,000
Alibaba |  |
Allowance for doubtful accounts | 0 | 0
Other related parties |  |
Allowance for doubtful accounts | 1,483,000 | 0
Third parties |  |
Allowance for doubtful accounts | $ 5,046,000 | $ 1,375,000

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