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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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