Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENT OF CHANGE IN EQUITY (PARENTHETICAL)

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CONDENSED CONSOLIDATED STATEMENT OF CHANGE IN EQUITY (PARENTHETICAL) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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