Balance Sheet Detail - Accounts receivable - long term, net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts receivable - long term
Total amount due from customer	$ 14,388	$ 20,886
Less discount	(545)	(912)
Less current portion included in accounts receivable, current	(9,308)	(12,537)
Total of accounts receivable, long term, net	4,535	$ 7,437
Accounts receivable sold to financial institution	$ 6,500

Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
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- Definition

Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- References

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- Definition

The amount of discount given on long term accounts receivable.

+ References

No definition available.

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- Definition

Amount of accounts receivable which have been sold to a financial institution.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The current amount of long term accounts receivable included in accounts receivable, current.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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