Stockholders' Equity (Deficit) - Schedule of Reserved Shares of Common Stock for Issuance (Details) shares in Thousands	Dec. 31, 2018 shares
Class Of Stock [Line Items]
Total reserved shares of common stock	33,296
Equity Incentive Plan
Class Of Stock [Line Items]
Common stock awards granted under equity incentive plans	20,057
Common stock awards available for grant under equity incentive plan	13,239

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant