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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allowance for doubtful accounts, Beginning balance			$ (1,708)
less allowance for doubtful accounts	$ (257)	$ (142)	(461)	$ (226)
Allowances for doubtful accounts	(1,199)	(959)	(2,116)	(1,755)
Bad debt expense			(2)
Total charges			(463)
Allowance for doubtful accounts, Ending balance	(2,171)		(2,171)
Medicaid [Member]
less allowance for doubtful accounts	(9)	(12)	(12)	(23)
Allowances for doubtful accounts	(9)	(11)	(12)	(23)
Medicare [Member]
less allowance for doubtful accounts	(68)	(42)	(127)	(62)
Allowances for doubtful accounts	(450)	(281)	(844)	(415)
Self-Pay [Member]
Allowances for doubtful accounts	(11)	(20)	(15)	(46)
Third Party Payer [Member]
less allowance for doubtful accounts	(180)	(88)	(322)	(141)
Allowances for doubtful accounts	(451)	(219)	(807)	(350)
Contract Diagnostic Services [Member]
Allowances for doubtful accounts	(274)	(368)	$ (427)	$ (856)
Clinical Research Grants and Other [Member]
Allowances for doubtful accounts	$ (4)	$ (60)

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- Definition

Allowance for doubtful accounts, revenue

+ References

No definition available.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of increase (decrease) in the allowance for doubtful accounts.

+ References

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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