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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Paid-in capital
Retained earnings
Accumulated other comprehensive loss
Beginning Balance (in shares) at Dec. 31, 2017   14,903,000      
Balance at beginning of year at Dec. 31, 2017 $ 210,279 $ 149 $ 178,909 $ 60,546 $ (29,325)
Comprehensive loss:          
Net loss (11,598)     (11,598)  
Translation adjustment 3,380       3,380
Derivative fair value adjustment (14)       (14)
Effect of retirement benefit obligations 18       18
Comprehensive loss $ (8,214)        
Issuance of 5,593,116 shares of common stock for acquisition of Filament, net of equity issuance costs (in shares) 5,593,116 5,593,000      
Issuance of 5,593,116 shares of common stock for acquisition of Filament, net of equity issuance costs $ 75,976 $ 56 75,920    
Restricted shares issued to directors (in shares)   3,000      
Net issuance of restricted shares to employees (in shares)   126,000      
Net issuance of restricted shares to employees   $ 1 (1)    
Stock compensation expense 838   838    
Shares effectively repurchased for required employee withholding taxes (in shares)   (19,000)      
Shares effectively repurchased for required employee withholding taxes (258)   (258)    
Dividends [1] (880)     (880)  
Ending Balance (in shares) at Mar. 31, 2018   20,606,000      
Balance at end of year at Mar. 31, 2018 277,741 $ 206 255,408 48,068 (25,941)
Beginning Balance (in shares) at Dec. 31, 2017   14,903,000      
Balance at beginning of year at Dec. 31, 2017 210,279 $ 149 178,909 60,546 (29,325)
Comprehensive loss:          
Net loss (17,655)        
Net change in cash flow hedges (277)        
Effect of retirement benefit obligations 35        
Comprehensive loss (20,006)        
Ending Balance (in shares) at Jun. 30, 2018   20,741,000      
Balance at end of year at Jun. 30, 2018 265,839 $ 207 256,182 41,126 (31,676)
Beginning Balance (in shares) at Mar. 31, 2018   20,606,000      
Balance at beginning of year at Mar. 31, 2018 277,741 $ 206 255,408 48,068 (25,941)
Comprehensive loss:          
Net loss (6,057)     (6,057)  
Translation adjustment (5,489)       (5,489)
Derivative fair value adjustment (263)       (263)
Net change in cash flow hedges (263)        
Effect of retirement benefit obligations 17       17
Comprehensive loss (11,792)        
Filament net equity issuance costs adjustment (6)   (6)    
Restricted shares issued to directors (in shares)   54,000      
Net issuance of restricted shares to employees (in shares)   93,000      
Net issuance of restricted shares to employees   $ 1 (1)    
Stock compensation expense 921   921    
Shares effectively repurchased for required employee withholding taxes (in shares)   (12,000)      
Shares effectively repurchased for required employee withholding taxes (140)   (140)    
Dividends [1] (885)     (885)  
Ending Balance (in shares) at Jun. 30, 2018   20,741,000      
Balance at end of year at Jun. 30, 2018 265,839 $ 207 256,182 41,126 (31,676)
Beginning Balance (in shares) at Dec. 31, 2018   20,764,000      
Balance at beginning of year at Dec. 31, 2018 279,493 $ 208 258,637 55,264 (34,616)
Comprehensive loss:          
Net loss (4,867)     (4,867)  
Translation adjustment 1,306       1,306
Net change in cash flow hedges 596       596
Effect of retirement benefit obligations 13       13
Comprehensive loss (2,952)        
Net issuance of restricted shares to employees (in shares)   169,000      
Net issuance of restricted shares to employees   $ 1 (1)    
Stock compensation expense 900   900    
Net exercise of stock options (in shares)   19,000      
Shares effectively repurchased for required employee withholding taxes (in shares)   (25,000)      
Shares effectively repurchased for required employee withholding taxes (232)   (232)    
Dividends [1] (898)     (898)  
Ending Balance (in shares) at Mar. 31, 2019   20,927,000      
Balance at end of year at Mar. 31, 2019 276,311 $ 209 259,304 49,499 (32,701)
Beginning Balance (in shares) at Dec. 31, 2018   20,764,000      
Balance at beginning of year at Dec. 31, 2018 279,493 $ 208 258,637 55,264 (34,616)
Comprehensive loss:          
Net loss (16,380)        
Net change in cash flow hedges 1,578        
Effect of retirement benefit obligations 25        
Comprehensive loss $ (16,424)        
Net exercise of stock options (in shares) 75,000        
Ending Balance (in shares) at Jun. 30, 2019   21,255,000      
Balance at end of year at Jun. 30, 2019 $ 263,104 $ 213 260,461 37,090 (34,660)
Beginning Balance (in shares) at Mar. 31, 2019   20,927,000      
Balance at beginning of year at Mar. 31, 2019 276,311 $ 209 259,304 49,499 (32,701)
Comprehensive loss:          
Net loss (11,513)     (11,513)  
Translation adjustment (2,953)       (2,953)
Net change in cash flow hedges 982       982
Effect of retirement benefit obligations 12       12
Comprehensive loss (13,472)        
Restricted shares issued to directors (in shares)   61,000      
Restricted shares issued to directors   $ 1 (1)    
Net issuance of restricted shares to employees (in shares)   250,000      
Net issuance of restricted shares to employees   $ 3 (3)    
Stock compensation expense 1,186   1,186    
Net exercise of stock options (in shares)   34,000      
Net exercise of stock options 133   133    
Shares effectively repurchased for required employee withholding taxes (in shares)   (17,000)      
Shares effectively repurchased for required employee withholding taxes (158)   (158)    
Dividends [1] (896)     (896)  
Ending Balance (in shares) at Jun. 30, 2019   21,255,000      
Balance at end of year at Jun. 30, 2019 $ 263,104 $ 213 $ 260,461 $ 37,090 $ (34,660)
[1] Cash dividends declared per share of common stock were $0.085 and $0.085 in the six months ended June 30, 2018 and 2019, respectively.