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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]      
Unrealized holding gain (loss) arising during the period, tax $ 4,412 $ 1,581 $ (2,931)
Reclassifications to net loss, tax 42 (681) 0
Unrealized holding gain (loss) arising during the period, tax 0 0 (1,214)
Reclassifications to net loss, tax $ 0 $ 0 $ (365)