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Other Balance Sheet Components - Accounts Receivable (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounts receivable, net: |  |  |
Total gross amount | $ 122,583,000 | $ 121,605,000 |
Allowance for doubtful accounts: |  |  |
Balance at the beginning of the year | (1,375,000) | (2,440,000) | $ (3,242,000)
Reversal (additional provision) charged to expenses, net | (7,787,000) | 368,000 | (2,138,000)
Write-off | 2,633,000 | 697,000 | 2,940,000
Balance at the end of the year | (6,529,000) | (1,375,000) | $ (2,440,000)
Accounts receivable, net | 116,054,000 | 120,230,000 |
Alibaba |  |  |
Accounts receivable, net: |  |  |
Total gross amount | 24,293,000 | 54,052,000 |
Allowance for doubtful accounts: |  |  |
Balance at the beginning of the year | 0 |  |
Balance at the end of the year | 0 | 0 |
Accounts receivable, net | 24,293,000 | 54,052,000 |
Other related parties |  |  |
Accounts receivable, net: |  |  |
Total gross amount | 31,589,000 | 33,961,000 |
Allowance for doubtful accounts: |  |  |
Balance at the beginning of the year | 0 |  |
Balance at the end of the year | (1,483,000) | 0 |
Accounts receivable, net | 30,106,000 | 33,961,000 |
Third parties |  |  |
Accounts receivable, net: |  |  |
Total gross amount | 66,701,000 | 33,592,000 |
Allowance for doubtful accounts: |  |  |
Balance at the beginning of the year | (1,375,000) |  |
Balance at the end of the year | (5,046,000) | (1,375,000) |
Accounts receivable, net | $ 61,655,000 | $ 32,217,000 |

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