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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax benefit $ 0 $ 0 $ 1,166,000
Loss from continuing operations before taxes 29,989,000 28,338,000 $ 6,769,000
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 144,374,000 117,272,000  
Tax credit carryforward 4,022,000    
State | North Carolina      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 110,954,000 117,721,000  
Tax credit carryforward 156,000    
State | New Jersey      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 28,255,000 $ 0