Balance Sheet Detail - Accounts receivable - long term, net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Balance Sheet Detail
Undiscounted cash flows June 30, 2020	$ 6,400
Undiscounted cash flows June 30, 2021	2,500
Undiscounted cash flows June 30, 2022	300
Accounts receivable - long term
Total amount due from customer	9,213	$ 11,169
Less unamortized discount	(335)	(391)
Less current portion included in accounts receivable	(6,173)	(7,622)
Total of accounts receivable, long term, net	$ 2,705	$ 3,156

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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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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

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Balance Type:	credit
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- Definition

Amount of undiscounted cash flows to be received for accounts receivable long term in the next fiscal year following latest fiscal year.

+ References

No definition available.

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- Definition

Amount of undiscounted cash flows to be received for accounts receivable long term in the third fiscal year following latest fiscal year.

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No definition available.

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Amount of undiscounted cash flows to be received for accounts receivable long term in the second fiscal year following latest fiscal year.

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- Definition

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

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