CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]	Total
Beginning balance at Dec. 31, 2019	$ 115	$ 32,604	$ 25,348		$ (31)	$ 25,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	0	0
Share-based compensation expense		644
Issuance of shares from exercise of stock options	1	353
Relinquishment of stock awards and restricted stock units to pay for withholding taxes		(41)
Net loss			(3,712)			(3,712)
Foreign currency translation adjustment, net of tax					(3)	(3)
Ending balance at Sep. 30, 2020	116	33,560	21,636	$ (32,110)	(34)	$ 23,168
Supplemental share information
Issuance of shares from stock awards (in shares)						93
Stock Issued During Period, Shares, New Issues						0
Relinquishment of stock awards to pay withholding taxes (in shares)						14
Beginning balance at Jun. 30, 2020	116	33,329	22,503		50	$ 23,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	0	0
Share-based compensation expense		231
Issuance of shares from exercise of stock options	0	0
Relinquishment of stock awards and restricted stock units to pay for withholding taxes		0
Net loss			(867)			(867)
Foreign currency translation adjustment, net of tax					(84)	(84)
Ending balance at Sep. 30, 2020	116	33,560	21,636	(32,110)	(34)	$ 23,168
Supplemental share information
Issuance of shares from stock awards (in shares)						2
Stock Issued During Period, Shares, New Issues						0
Relinquishment of stock awards to pay withholding taxes (in shares)						0
Beginning balance at Dec. 31, 2020	130	42,536	19,718		(38)	$ 30,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	9	11,201
Share-based compensation expense		952
Issuance of shares from exercise of stock options	0	284
Relinquishment of stock awards and restricted stock units to pay for withholding taxes		(100)
Net loss			(3,410)			(3,410)
Foreign currency translation adjustment, net of tax					108	108
Ending balance at Sep. 30, 2021	139	54,873	16,308	(32,110)	70	$ 39,280
Supplemental share information
Issuance of shares from stock awards (in shares)						94
Stock Issued During Period, Shares, New Issues						842
Relinquishment of stock awards to pay withholding taxes (in shares)						32
Beginning balance at Jun. 30, 2021	130	43,408	15,398		47	$ 26,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	9	11,201
Share-based compensation expense		257
Issuance of shares from exercise of stock options	0	7
Relinquishment of stock awards and restricted stock units to pay for withholding taxes		0
Net loss			910			910
Foreign currency translation adjustment, net of tax					23	23
Ending balance at Sep. 30, 2021	$ 139	$ 54,873	$ 16,308	$ (32,110)	$ 70	$ 39,280
Supplemental share information
Issuance of shares from stock awards (in shares)						3
Stock Issued During Period, Shares, New Issues						842
Relinquishment of stock awards to pay withholding taxes (in shares)						0