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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Millions | Jun. 30, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
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Accumulated depreciation | $ | $ 25.8 | $ 22.9
Ordinary shares, authorized | 60,000,000 | 60,000,000
Ordinary shares, issued | 37,839,833 | 37,351,653
Ordinary shares, outstanding | 37,839,833 | 37,351,653

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