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Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net loss $ (7,614) $ (7,963)
Other comprehensive loss, net of tax:    
Unrealized loss resulting from changes in fair value of marketable securities (83) (34)
Other comprehensive loss, net of tax (83) (34)
Comprehensive loss (7,697) (7,997)
Less: Comprehensive (loss) income attributable to noncontrolling interests (6) 1,308
Comprehensive loss attributable to common stockholders $ (7,691) $ (9,305)