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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 income (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
Total 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, 2018   20,764,000      
Balance at beginning of year at Dec. 31, 2018 279,493 $ 208 258,637 55,264 (34,616)
Comprehensive income (loss):          
Net loss (4,867)     (4,867)  
Translation adjustment 1,306       1,306
Derivative fair value adjustment 596       596
Effect of retirement benefit obligations 13       13
Total 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) 25,000 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)
[1] Cash dividends declared per share of common stock were $0.0425 and $0.0425 in 2018 and 2019, respectively.