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Other Balance Sheet Accounts Details - Purchased Intangible Assets, net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 7,986	$ 7,986
Accumulated Amortization	(7,124)	(5,681)
Net	862	2,305
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	5,050	5,050
Accumulated Amortization	(4,545)	(3,535)
Net	505	1,515
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	2,936	2,936
Accumulated Amortization	(2,579)	(2,146)
Net	$ 357	$ 790

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
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