CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balance, beginning at Dec. 31, 2017	$ 2	$ 267,857	$ (5,297)	$ (2,108)	$ (203,996)	$ 56,458
Balance, beginning (in shares) at Dec. 31, 2017	18,728,912
Net income (loss)					(370)	(370)
Other comprehensive income (loss)				(298)		(298)
Issuance of common stock upon exercise of stock options for cash and releases of RSUs		102				102
Issuance of common stock upon exercise of stock options for cash and releases of RSUs (in shares)	55,095
Issuance of common stock under employee stock purchase plan		34				34
Issuance of common stock under employee stock purchase plan (in shares)	15,435
Stock-based compensation expense		484				484
Balance, ending at Jun. 30, 2018	$ 2	268,477	(5,297)	(2,406)	(204,366)	56,410
Balance, ending (in shares) at Jun. 30, 2018	18,799,442
Balance, beginning at Mar. 31, 2018	$ 2	268,233	(5,297)	(2,254)	(204,762)	55,922
Balance, beginning (in shares) at Mar. 31, 2018	18,728,912
Net income (loss)					396	396
Other comprehensive income (loss)				(152)		(152)
Issuance of common stock upon exercise of stock options for cash and releases of RSUs		102				102
Issuance of common stock upon exercise of stock options for cash and releases of RSUs (in shares)	55,095
Issuance of common stock under employee stock purchase plan		34				34
Issuance of common stock under employee stock purchase plan (in shares)	15,435
Stock-based compensation expense		108				108
Balance, ending at Jun. 30, 2018	$ 2	268,477	(5,297)	(2,406)	(204,366)	56,410
Balance, ending (in shares) at Jun. 30, 2018	18,799,442
Balance, beginning at Dec. 31, 2018	$ 2	268,794	(5,297)	(2,507)	(213,096)	$ 47,896
Balance, beginning (in shares) at Dec. 31, 2018	18,955,264					18,955,264
Net income (loss)					2,096	$ 2,096
Other comprehensive income (loss)				186		186
Issuance of common stock under employee stock purchase plan		27				27
Issuance of common stock under employee stock purchase plan (in shares)	13,486
Stock-based compensation expense		142				142
Balance, ending at Jun. 30, 2019	$ 2	268,963	(5,297)	(2,321)	(211,000)	$ 50,347
Balance, ending (in shares) at Jun. 30, 2019	18,968,750					18,968,750
Balance, beginning at Mar. 31, 2019	$ 2	268,846	(5,297)	(2,358)	(211,653)	$ 49,540
Balance, beginning (in shares) at Mar. 31, 2019	18,955,264
Net income (loss)					653	653
Other comprehensive income (loss)				37		37
Issuance of common stock under employee stock purchase plan		27				27
Issuance of common stock under employee stock purchase plan (in shares)	13,486
Stock-based compensation expense		90				90
Balance, ending at Jun. 30, 2019	$ 2	$ 268,963	$ (5,297)	$ (2,321)	$ (211,000)	$ 50,347
Balance, ending (in shares) at Jun. 30, 2019	18,968,750					18,968,750