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, 2016 USD ($) item	Dec. 31, 2015 USD ($)
Accounts Receivable
Number of days for evaluating significant balances for credit risk	30 days
Number of largest customers \| item	5
Concentration risk (as a percent)	10.00%
Allowance for Doubtful Accounts
Bad debt expense	$ 65	$ 87
LONG-LIVED ASSETS
Depreciation & amortization expense	6,471	8,736
Interest cost capitalized	$ 0	$ 0
Consolidated revenues \| Customer concentration
Accounts Receivable
Concentration risk (as a percent)	91.00%	92.00%
Outstanding A/R balances \| Customer concentration
Accounts Receivable
Concentration risk (as a percent)	86.00%	71.00%

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Represents the number of largest customers.

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Period for evaluating credit risk.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of interest capitalized during the period.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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