75000 - Document - Cover link:presentationLink link:calculationLink link:definitionLink Entity Incorporation, State or Country Code Entity Current Reporting Status Document Fiscal Period Focus Entity Shell Company Entity Filer Category Entity Small Business Entity Well-known Seasoned Issuer Common Class A [Member] Class A Common Stock Amendment Flag Entity Address, Postal Zip Code Entity Address, Address Line One Document Type Entity Central Index Key Document Financial Statement Error Correction [Flag] Current Fiscal Year End Date Entity Address, State or Province Common Class B [Member] Class B Common Stock Auditor Firm ID Document Information [Line Items] Entity Address, City or Town Security Exchange Name Document Period End Date ICFR Auditor Attestation Flag Class of Stock [Axis] Entity File Number Cover [Abstract] Document Transition Report Document Fiscal Year Focus Title of 12(b) Security Document Information [Table] Trading Symbol Document Annual Report Entity Public Float Entity Registrant Name Entity Voluntary Filers Amendment Description Entity Common Stock, Shares Outstanding City Area Code Auditor Name Auditor Location Entity Interactive Data Current Entity Tax Identification Number Local Phone Number Class of Stock [Domain] Entity Emerging Growth Company