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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Reclassification adjustments to net loss resulting from realized gains or losses on sale of securities $ 0 $ 0 $ 0
Other comprehensive income, tax $ 0 $ 0 $ 0