Balance Sheet Detail - Accounts receivable - long term, net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Balance Sheet Detail
Undiscounted cash flows September 30, 2020	$ 5,000
Undiscounted cash flows September 30, 2021	1,900
Undiscounted cash flows September 30, 2022	200
Accounts receivable - long term
Total amount due from customer	7,079	$ 11,169
Less unamortized discount	(251)	(391)
Less current portion included in accounts receivable	(4,788)	(7,622)
Total of accounts receivable, long term, net	$ 2,040	$ 3,156

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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Balance Type:	debit
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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 310
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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- Definition

The amount of discount given on long term accounts receivable.

+ References

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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.

+ References

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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