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Consolidated Statements of Equity (Unaudited) - USD ($)
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Deficit [Member]
Noncontrolling Interests [Member]
Balance (in shares) at Dec. 31, 2015   15,332,041        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 5,999          
Proceeds from Stock Options Exercised $ 14,000   $ 14,000      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   321,068        
Noncontrolling Interest, Increase from Subsidiary Equity Issuance 4,000         $ 4,000
Redemption and retirement of shares (in shares)   (311,022)        
Balance (in shares) at Dec. 31, 2016   15,348,086        
Balance at Dec. 31, 2015 10,951,000 $ 0 211,083,000 $ (600,000) $ (199,524,000) (8,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Amortization of deferred stock-based compensation costs 1,416,000   1,416,000      
Redemption and retirement of shares (949,000)   (949,000)   0  
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 82,000   82,000      
Net loss (6,341,000)       (6,335,000) (6,000)
Foreign currency translation adjustment, net of tax       600,000    
Balance at Dec. 31, 2016 5,777,000 $ 0 211,646,000 0 (205,859,000) (10,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest $ (5,741,000)          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0          
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   102,000        
Noncontrolling Interest, Increase from Subsidiary Equity Issuance $ 7,000         (7,000)
Redemption and retirement of shares (in shares)   (158,202)        
Balance (in shares) at Dec. 31, 2017   15,291,884        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Amortization of deferred stock-based compensation costs 1,528,000   1,528,000      
Redemption and retirement of shares (389,000)   (389,000)   0  
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0          
Net loss (40,872,000)       (40,781,000) (91,000)
Foreign currency translation adjustment, net of tax       (2,178,000)    
Balance at Dec. 31, 2017 (36,127,000) $ 0 $ 212,785,000 $ (2,178,000) $ (246,640,000) $ (94,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest $ (43,050,000)