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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts, net | $ 34 | $ 36
Prepayments from customers, current | 6,647 | 11,968
Accrued expenses and other current liabilities | 60,429 | 51,854
Income tax payable | 11,685 | 10,534
Deferred revenue, current | 29,578 | 22,666
Prepayments from customers, non-current | 3,582 | 8,542
Deferred revenue, non-current | 6,915 | 10,396
Other non-current liabilities | 8,541 | $ 8,484
Deferred income tax liabilities | $ 1,110 |
Ordinary shares, par value (in dollars per share) | $ 0.001 | $ 0.001
Ordinary shares, shares authorized (in shares) | 99,999,999 | 99,999,999
Ordinary shares, shares issued (in shares) | 29,213,801 | 29,213,801
Ordinary shares, shares outstanding (in shares) | 29,213,801 | 29,213,801
VIE |  |
Prepayments from customers, current | $ 6,647 | $ 11,962
Accrued expenses and other current liabilities | 54,443 | 48,123
Income tax payable | 11,298 | 10,125
Deferred revenue, current | 29,578 | 22,327
Prepayments from customers, non-current | 3,582 | 8,542
Deferred revenue, non-current | 5,567 | 8,505
Other non-current liabilities | 8,541 | 8,484
Deferred income tax liabilities | $ 1,110 | $ 0

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