OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) € in Thousands, SFr in Thousands, RM in Thousands, $ in Thousands, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 CHF (SFr)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 AUD ($)	Dec. 31, 2020 MYR (RM)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 AUD ($)	Dec. 31, 2019 MYR (RM)	Dec. 31, 2017 USD ($)
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balances at beginning of period				$ 186,000	$ 186,000	$ 245,000	$ 215,000
Additions from acquisition					90,000	0	0
Additions - charged to expense					614,000	113,000	104,000
Deductions - write offs, net of recoveries					(121,000)	(172,000)	(74,000)
Balances at end of period	$ 769,000				769,000	186,000	245,000
Cash and cash equivalents	86,334,000				86,334,000	89,030,000	13,389,000		€ 8,520	SFr 138	$ 2,993	$ 159	RM 364	€ 1,773	SFr 124	$ 88	$ 54	RM 0	$ 9,659,000
Impairment of intangible assets (excluding goodwill)					0	0	0
Advertising expense					400,000	300,000	200,000
Operating lease right-of-use assets	5,457,000				5,457,000	5,726,000
Operating lease liability	5,945,000				5,945,000
Interest expense					6,374,000	3,089,000	310,000
Deferred tax liability	11,856,000				11,856,000	691,000
Income tax expense (benefit)					239,000	(1,446,000)	(2,115,000)
Stockholders' equity	287,053,000				287,053,000	154,364,000	122,409,000												100,440,000
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Doubtful Accounts Receivable [Roll Forward]
Stockholders' equity						(18,000)													2,634,000
Revision of Prior Period, Error Correction, Adjustment | Noncash Debt Interest Expense Calculation
Allowance for Doubtful Accounts Receivable [Roll Forward]
Interest expense	(2,500,000)	$ 500,000	$ 600,000	600,000		700,000
Convertible notes	(2,500,000)	2,500,000	2,000,000.0	1,400,000	(2,500,000)	700,000
Deferred tax liability	(600,000)	$ 600,000	$ 400,000	$ 300,000	(600,000)	200,000
Income tax expense (benefit)	600,000
Accumulated Deficit
Allowance for Doubtful Accounts Receivable [Roll Forward]
Stockholders' equity	$ (150,861,000)				$ (150,861,000)	(136,444,000)	$ (134,979,000)												(143,463,000)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Doubtful Accounts Receivable [Roll Forward]
Stockholders' equity						$ (18,000)													$ 2,634,000
Accumulated Deficit | ASU 2020-06 | Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event
Allowance for Doubtful Accounts Receivable [Roll Forward]
Stockholders' equity								$ 4,300,000
Building | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					10 years
Building | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					43 years
Machinery and equipment | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					2 years
Machinery and equipment | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					10 years
Office furniture & equipment | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					3 years
Office furniture & equipment | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					7 years
Computer hardware & software | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					3 years
Computer hardware & software | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					5 years
Leasehold and building improvements | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					5 years
Leasehold and building improvements | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					15 years
Software Development | Minimum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					3 years
Software Development | Maximum
Allowance for Doubtful Accounts Receivable [Roll Forward]
Property plant and equipment, useful life					7 years
Customer Concentration Risk | Accounts Receivable | Henry Schein
Property, Plant and Equipment [Line Items]
Concentration risk, percentage					9.00%	19.00%