Redeemable Convertible Preferred Stock - Conversion (Details) $ in Thousands		6 Months Ended
Jun. 14, 2019 USD ($) shares	Jul. 31, 2019 USD ($)
Redeemable Convertible Preferred Stock
Value of converted shares		$ 659,207
IPO \| Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Number of shares converted \| shares	131,267,586
Stock Conversion, Preferred Stock Conversion Ratio	1
Value of converted shares	$ 557,900

The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration