001 - Document - Document and Entity Information link:presentationLink link:definitionLink link:calculationLink 002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:definitionLink link:calculationLink 003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 004 - Statement - Condensed Consolidated Statements of Operations (Unaudited) link:presentationLink link:definitionLink link:calculationLink 005 - Statement - Condensed Consolidated Statements of Equity (Unaudited) link:presentationLink link:definitionLink link:calculationLink 006 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:definitionLink link:calculationLink 007 - Disclosure - Basis of Presentation link:presentationLink link:definitionLink link:calculationLink 008 - Disclosure - Net Income (Loss) Per Common Share link:presentationLink link:definitionLink link:calculationLink 009 - Disclosure - Cash and Cash Equivalents link:presentationLink link:definitionLink link:calculationLink 010 - Disclosure - Revenue Recognition link:presentationLink link:definitionLink link:calculationLink 011 - Disclosure - Marketable Securities link:presentationLink link:definitionLink link:calculationLink 012 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:definitionLink link:calculationLink 013 - Disclosure - Stockholders' Equity link:presentationLink link:definitionLink link:calculationLink 014 - Disclosure - Other Matters link:presentationLink link:definitionLink link:calculationLink 015 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:definitionLink link:calculationLink 016 - Disclosure - Revenue Recognition (Policies) link:presentationLink link:definitionLink link:calculationLink 017 - Disclosure - Cash and Cash Equivalents (Tables) link:presentationLink link:definitionLink link:calculationLink 018 - Disclosure - Marketable Securities (Tables) link:presentationLink link:definitionLink link:calculationLink 019 - Disclosure - Cash and Cash Equivalents (Details) link:presentationLink link:definitionLink link:calculationLink 020 - Disclosure - Marketable Securities (Details) link:presentationLink link:definitionLink link:calculationLink 021 - Disclosure - Marketable Securities (Details 1) link:presentationLink link:definitionLink link:calculationLink 022 - Disclosure - Stockholders' Equity (Details) link:presentationLink link:definitionLink link:calculationLink