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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - A/R, Allowances of A/R and PPE - (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item
Accounts Receivable
Number of days for evaluating significant balances for credit risk	30 days
Number of largest customers | item	5	5
Allowance for Doubtful Accounts
Bad debt (recoveries) expense	$ (34)
Bad debt (recoveries) expense		$ 80
LONG-LIVED ASSETS
Depreciation & amortization expense	7,299	7,235
Interest cost capitalized	$ 0	$ 0
Consolidated revenues | Customer concentration
Accounts Receivable
Concentration risk (as a percent)	78.00%	85.00%
Outstanding A/R balances | Customer concentration
Accounts Receivable
Concentration risk (as a percent)	54.00%	57.00%

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Amount of recoveries of receivables doubtful of collection that were previously charged off with the bad debt expense recorded during the period.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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