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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Statement Of Income And Comprehensive Income [Abstract]  
Net loss $ (39,029)
Other comprehensive income:  
Unrealized losses on available for sale securities, net of tax of $61 (299)
Total comprehensive loss $ (39,328)