ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - EPS, REVENUE RECOGNITION, CONTRACT BALANCES AND COSTS AND WARRANTY RESERVE (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Revenue recognized which was previously deferred	$ 2.0	$ 1.8	$ 4.1	$ 3.7
Deferred commissions related amortization			$ 0.5		$ 0.5
Stock options
Property, Plant and Equipment [Line Items]
Potentially dilutive shares excluded from computation of diluted earnings per share due	0.4	0.5	0.4	0.5
Warrant
Property, Plant and Equipment [Line Items]
Potentially dilutive shares excluded from computation of diluted earnings per share due	1.4	0.4	1.4	0.4
Converted preferred stock
Property, Plant and Equipment [Line Items]
Potentially dilutive shares excluded from computation of diluted earnings per share due	2.2	2.2	2.2	2.2
Unvested restricted shares
Property, Plant and Equipment [Line Items]
Potentially dilutive shares excluded from computation of diluted earnings per share due	0.2	0.4	0.2	0.4
Minimum
Property, Plant and Equipment [Line Items]
Period fees are due for adjustable rebate contracts			30 days
Maximum
Property, Plant and Equipment [Line Items]
Period fees are due for adjustable rebate contracts			60 days
Interactive devices | Minimum
Property, Plant and Equipment [Line Items]
Hardware maintenance services terms (in months)			30 months
Interactive devices | Maximum
Property, Plant and Equipment [Line Items]
Hardware maintenance services terms (in months)			60 months
Non-interactive projectors
Property, Plant and Equipment [Line Items]
Hardware maintenance services terms (in months)			60 months