Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2015	$ 129,000	$ 110,116,000	$ (85,128,000)	$ (500,000)	$ (4,047,000)	$ 20,570,000
Balance, shares at Dec. 31, 2015	14,211,000
Net loss			(6,370,000)			(6,370,000)
Foreign currency translation adjustment				408,000		408,000
Unrealized loss on investments, net of realized amounts				(11,000)		(11,000)
Shares issued pursuant to exercise of stock options		70,000				70,000
Shares issued pursuant to exercise of stock options, shares	20,000
Issuance of restricted stock
Issuance of restricted stock, shares	566,000
Forfeiture of restricted shares
Forfeiture of restricted shares, shares	(219,000)
Shares withheld pursuant to exercise of stock options					(323,000)	(323,000)
Stock based compensation - restricted stock		908,000				908,000
Stock based compensation - options and performance shares		750,000				750,000
Balance at Dec. 31, 2016	$ 129,000	111,844,000	(91,498,000)	(103,000)	(4,370,000)	16,002,000
Balance, shares at Dec. 31, 2016	14,578,000
Net loss			(3,870,000)			(3,870,000)
Foreign currency translation adjustment				(373,000)		(373,000)
Unrealized loss on investments, net of realized amounts				(102,000)		(102,000)
Shares issued pursuant to exercise of stock options	$ 3,000	1,274,000				1,277,000
Shares issued pursuant to exercise of stock options, shares	271,000
Issuance of restricted stock	$ 19,000	(19,000)
Issuance of restricted stock, shares	240,000
Forfeiture of restricted shares	$ (1,000)	1,000
Forfeiture of restricted shares, shares	(58,000)
Shares withheld pursuant to exercise of stock options					(465,000)	(465,000)
Stock based compensation - restricted stock		1,682,000				1,682,000
Stock based compensation - options and performance shares		755,000				755,000
Shares issued pursuant to an underwritten public offering, net of issuance costs of $1,200,000	$ 30,000	16,035,000				16,065,000
Shares issued pursuant to an underwritten public offering, net of issuance costs of $1,200,000, shares	3,000,000
Shares issued pursuant to Keytroller acquisition	$ 3,000	1,997,000				2,000,000
Shares issued pursuant to Keytroller acquisition, shares	296,000
Balance at Dec. 31, 2017	$ 183,000	133,569,000	(95,368,000)	(578,000)	(4,835,000)	32,971,000
Balance, shares at Dec. 31, 2017	18,327,000
Net loss			(5,812,000)			(5,812,000)
Foreign currency translation adjustment				77,000		77,000
Unrealized loss on investments, net of realized amounts						66,000
Shares issued pursuant to exercise of stock options	$ 2,000	968,000				970,000
Shares issued pursuant to exercise of stock options, shares	169,000
Issuance of restricted stock	$ 4,000	(4,000)
Issuance of restricted stock, shares	434,000
Forfeiture of restricted shares
Forfeiture of restricted shares, shares	(48,000)
Shares withheld pursuant to exercise of stock options					(249,000)	(249,000)
Stock based compensation - restricted stock		1,803,000				1,803,000
Stock based compensation - options and performance shares		360,000				360,000
Reclassification of realized losses on investments, net of unrealized amounts				66,000		66,000
Shares issued relating to acquisition contingent consideration	$ 3,000	1,997,000				2,000,000
Shares issued relating to acquisition contingent consideration, shares	296,000
Shares repurchased pursuant to vesting of restricted stock					(652,000)	(652,000)
Balance at Dec. 31, 2018	$ 192,000	$ 138,693,000	$ (101,180,000)	$ (435,000)	$ (5,736,000)	$ 31,534,000
Balance, shares at Dec. 31, 2018	19,178,000