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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net loss $ (28,008) $ (23,467)
Unrealized gain on available-for-sale securities, net of tax 23  
Comprehensive loss $ (27,985) $ (23,467)