INCOME TAXES (Details) (USD $)	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Loss before provision for income taxes [Abstract]
U.S.										$ (4,919,000)	$ (6,767,000)		$ (10,458,000)
Foreign										118,000	437,000		640,000
Loss before income taxes	(235,000)	(1,837,000)	(548,000)	(2,181,000)	1,173,000		(956,000)	(1,377,000)	(5,170,000)	(4,801,000)	(6,330,000)		(9,818,000)
Current [Abstract]
Federal										(329,000)	(13,000)		(52,000)
State										7,000	(56,000)		69,000
Foreign										159,000	366,000		208,000
Total Current										(163,000)	297,000		225,000
Deferred [Abstract]
Federal										33,000	(12,000)		(13,000)
State										0	0		13,000
Foreign										76,000	(67,000)		18,000
Total Deferred										109,000	(79,000)		18,000
Tax (benefit) provision	43,000	(169,000)	90,000	(18,000)	96,000		(64,000)	89,000	97,000	(54,000)	218,000		243,000
Deferred tax assets [Abstract]
Net operating loss	11,014,000				9,828,000	[1]				11,014,000	9,828,000	[1]
Stock-based compensation	3,806,000				5,561,000	[1]				3,806,000	5,561,000	[1]
Other accruals and reserves	3,686,000				3,259,000	[1]				3,686,000	3,259,000	[1]
Credits	3,121,000				2,261,000	[1]				3,121,000	2,261,000	[1]
Capital loss	0				796,000	[1]				0	796,000	[1]
Foreign	360,000				436,000	[1]				360,000	436,000	[1]
Accrued warranty	441,000				466,000	[1]				441,000	466,000	[1]
Depreciation and amortization	224,000				180,000	[1]				224,000	180,000	[1]
Other	470,000				(450,000)	[1]				470,000	(450,000)	[1]
Deferred tax asset before valuation allowance	23,122,000				22,337,000	[1]				23,122,000	22,337,000	[1]
Valuation allowance	(22,762,000)				(21,907,000)	[1]				(22,762,000)	(21,907,000)	[1]
Deferred tax asset after valuation allowance	360,000				430,000	[1]				360,000	430,000	[1]
Deferred tax liability on indefinite-lived tangible asset	(39,000)				0	[1]				(39,000)	0	[1]
Net deferred tax asset after valuation allowance	321,000				430,000	[1]				321,000	430,000	[1]
Deferred tax asset balance in Consolidated Balance Sheets [Abstract]
Deferred tax asset (current portion)	31,000				40,000					31,000	40,000
Deferred tax asset, net of current portion	329,000				553,000					329,000	553,000
Accrued liabilities (current deferred tax liability)	0				(163,000)					0	(163,000)
Accrued liabilities (non-current deferred tax liability)	(39,000)				0					(39,000)	0
Net deferred tax asset after valuation allowance	321,000				430,000	[1]				321,000	430,000	[1]
Differences between the U.S. federal statutory income tax rate to the Company's effective tax [Abstract]
U.S. federal statutory income tax rate (in hundredths)										35.00%	35.00%	[1],[2]	35.00%	[1],[2]
State tax rate, net of federal benefit (in hundredths)										1.57%	3.28%	[1],[2]	2.56%	[1],[2]
Benefit for research and development credit (in hundredths)										19.91%	3.40%	[1],[2]	6.02%	[1],[2]
Foreign rate differential (in hundredths)										(4.53%)	(1.49%)	[1],[2]	0.00%	[1],[2]
Changes in unrecognized tax benefits (in hundredths)										2.60%	1.06%	[1],[2]	(0.02%)	[1],[2]
Foreign income inclusion (in hundredths)										0.00%	(0.05%)	[1],[2]	(2.15%)	[1],[2]
Income tax refund (in hundredths)										0.19%	1.07%	[1],[2]	2.33%	[1],[2]
Stock-based compensation (in hundredths)										(34.33%)	(21.31%)	[1],[2]	(15.82%)	[1],[2]
Meals and entertainment (in hundredths)										(2.10%)	(1.68%)	[1],[2]	(0.88%)	[1],[2]
Tax effect of other comprehensive income (in hundredths)										0.00%	0.28%	[1],[2]	(2.01%)	[1],[2]
Valuation allowance (in hundredths)										(17.82%)	(21.15%)	[1],[2]	(28.51%)	[1],[2]
Other (in hundredths)										0.63%	(1.86%)	[1],[2]	1.00%	[1],[2]
Effective tax rate (in hundredths)										1.12%	(3.45%)	[1],[2]	(2.48%)	[1],[2]
Net increase in the valuation allowance										900,000	1,400,000		2,800,000
Operating Loss Carryforwards [Line Items]
Tax credit recorded to additional paid in capital	3,900,000									3,900,000
Undistributed earnings of foreign subsidiaries	2,600,000									2,600,000
Gross unrecognized tax benefits [Roll Forward]
Balance at beginning of year				536,000					583,000	536,000	583,000		555,000
Increases related to prior year tax positions										36,000	0		0
Increases related to current year tax positions										116,000	29,000		44,000
Decreases related to lapsing of statute of limitations										(153,000)	(76,000)		(16,000)
Balance at end of year	535,000				536,000					535,000	536,000		583,000
Unrecognized tax benefits that would impact effective tax rate	33,000				325,000					33,000	325,000
Unrecognized tax benefits, interest on income taxes accrued	37,000				86,000					37,000	86,000
Estimated period of unrecognized tax benefits remain unchanged										12 months
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	30,000,000									30,000,000
Operating loss carryforwards, expiration dates										2033
Research and development tax credits	3,600,000									3,600,000
Tax credit carryforward, expiration date										Dec. 31, 2033
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	10,000,000									10,000,000
Operating loss carryforwards, expiration dates										2032
Research and development tax credits	4,500,000									4,500,000
Tax credit carryforward, expiration date										Dec. 31, 2020
Research and development tax credits expiring in 2020	$ 284,000									$ 284,000

[1] The Company revised its 2012 deferred tax asset balances relating to its net operating loss, stock-based compensation, other assets and valuation allowance. These changes had no impact to the balance sheet, statement of operations, earnings per share, statement of cash flows, or statement of equity for any period presented.

[2] Certain amounts have been reclassified to conform to current period presentation.