REVENUE - Narrative (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) contract	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Revenue recognized on liability balances				$ 200,000	$ 0
Revenue recognized from performance obligations satisfied in previous periods				0	0
Cost of revenue (excluding depreciation and amortization)		$ 1,679,000	$ 189,000	2,910,000	3,323,000
Accounts receivable		2,850,000		2,850,000		$ 1,964,000
Revenue recognized on projects		2,646,000	$ 686,000	5,376,000	$ 4,760,000
AI Solutions
Disaggregation of Revenue [Line Items]
Number of contracts | contract	2
Cost of revenue (excluding depreciation and amortization)	$ 4,000,000.0
Accounts receivable	$ 4,600,000	$ 3,200,000		3,200,000		3,400,000
Revenue recognized on projects				$ 200,000		$ 1,100,000