Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Unrealized gain(loss) on investments, net of tax of $ 0 $ 0 $ 27
Foreign currency translation adjustments, net of tax benefit of 200 202 39
Unrealized gain on interest rate swap, net of tax of $ 187 $ 257 $ 0