CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in excess of Par Value	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance (in shares) at Dec. 31, 2017		17,677,000				(1,708,000)
Balance at Dec. 31, 2017	$ 68,986	$ 354	$ 48,349	$ 29,549	$ (3,430)	$ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,122)			(24,122)
Issuance of common stock upon the exercise of stock options (in shares)		168,000
Issuance of common stock upon the exercise of stock options	866	$ 3	863
Net issuance of restricted stock awards (in shares)		34,000
Net issuance of restricted stock awards	0	$ 0
Equity based compensation	1,039		1,039
Foreign currency translation adjustments	$ (823)				(823)
Balance (in shares) at Dec. 31, 2018	16,171,652	17,879,000				(1,708,000)
Balance at Dec. 31, 2018	$ 45,946	$ 357	50,251	5,427	(4,253)	$ (5,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (15,571)			(15,571)
Issuance of common stock upon the exercise of stock options (in shares)	256,000	256,000
Issuance of common stock upon the exercise of stock options	$ 1,433	$ 5	1,428
Net issuance of restricted stock awards (in shares)		225,000
Net issuance of restricted stock awards	0	$ 5	(5)
Treasury stock acquired from employees upon exercise of stock options (in shares)						(23,000)
Treasury stock acquired from employees upon exercise of stock options	(544)					$ (544)
Equity based compensation	2,706		2,706
Acquisition consideration	27,527		27,527
Convertible notes conversion discount	12,465		12,465
Foreign currency translation adjustments	$ (1,115)				(1,115)
Balance (in shares) at Dec. 31, 2019	16,629,177	18,360,000				(1,731,000)
Balance at Dec. 31, 2019	$ 72,847	$ 367	$ 94,372	$ (10,144)	$ (5,368)	$ (6,380)