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Redeemable convertible preferred stock	3 Months Ended
Redeemable convertible preferred stock	Mar. 31, 2018
Redeemable convertible preferred stock
Redeemable convertible preferred stock	7. Redeemable convertible preferred stock The Company has authorized preferred stock amounting to 5,000,000 shares as of March 31, 2018 and December 31, 2017. The authorized preferred stock was classified under stockholders’ equity at March 31, 2018 and December 31, 2017.