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Subsequent event	12 Months Ended
Subsequent event	Dec. 31, 2018
Subsequent event
Subsequent event	Note 19. Subsequent event On January 1, 2019, in accordance with the Evergreen Provisions of the 2015 Plan, the Company added 2,483,815 shares to the option pool, increasing the total number of shares reserved and available for issuance under the 2015 Plan to 4,277,720 shares.