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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
VIEs
Cash and cash equivalents	$ 151,063	$ 170,385
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	50,715,518	51,448,753
Common stock, shares outstanding	50,715,518	51,448,753
VIEs
VIEs
Cash and cash equivalents	$ 3,127	$ 60,256

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