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Equity Incentive Plans - Recorded Stock-Based Compensation Expense in the Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expensed [Line Items]
Stock-based compensation expense	$ 13,855	$ 3,025	$ 20,573	$ 4,384
Cost of revenue
Share-based Payment Arrangement, Expensed [Line Items]
Stock-based compensation expense	463	58	710	90
Research and development
Share-based Payment Arrangement, Expensed [Line Items]
Stock-based compensation expense	6,044	1,291	8,931	1,798
Selling, general and administrative
Share-based Payment Arrangement, Expensed [Line Items]
Stock-based compensation expense	$ 7,348	$ 1,676	$ 10,932	$ 2,496

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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