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CONDENSED CONSOLIDATED STATEMENT OF CHANGE IN EQUITY (PARENTHETICAL) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other comprehensive income (loss), available-for-sale securities, before reclassification adjustments, tax |  |  |  |
Unrealized holding gains on available-for-sale debt securities, tax | $ 0 | $ 0 | $ 0 | $ 0
Reclassification from accumulated other comprehensive income of losses on available-for-sale debt securities included in net loss, tax | $ 0 | $ 0 | $ 0 | $ 0

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