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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
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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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