2105100 - Disclosure - Cash, cash equivalents and short-term investments link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Cash, cash equivalents and short-term investments (Details) link:presentationLink link:calculationLink link:definitionLink 2405403 - Disclosure - Cash, cash equivalents and short-term investments - Summary of cost and estimated fair value of short-term investmetns (Details) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Cash, cash equivalents and short-term investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Commitments and contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Commitments and contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Commitments and contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2107100 - Disclosure - Fair value of financial instruments link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Fair value of financial instruments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Fair value of financial instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2307301 - Disclosure - Fair value of financial instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Guarantees and indemnifications link:presentationLink link:calculationLink link:definitionLink 2124100 - Disclosure - Income taxes link:presentationLink link:calculationLink link:definitionLink 2424401 - Disclosure - Income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - Net income per share link:presentationLink link:calculationLink link:definitionLink 2402402 - Disclosure - Net income per share (Details) link:presentationLink link:calculationLink link:definitionLink 2302301 - Disclosure - Net income per share (Tables) link:presentationLink link:calculationLink link:definitionLink 2113100 - Disclosure - Stock-based compensation link:presentationLink link:calculationLink link:definitionLink 2413405 - Disclosure - Stock-based compensation - Assumptions Used to Estimate Weighted Average Fair Value of Options (Details) link:presentationLink link:calculationLink link:definitionLink 2413402 - Disclosure - Stock-based compensation (Details) link:presentationLink link:calculationLink link:definitionLink 2413404 - Disclosure - Stock-based compensation - Summary of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2413403 - Disclosure - Stock-based compensation - Summary of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2313301 - Disclosure - Stock-based compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 2118100 - Disclosure - Stock repurchase program link:presentationLink link:calculationLink link:definitionLink 2418401 - Disclosure - Stock repurchase program (Details) link:presentationLink link:calculationLink link:definitionLink 2130100 - Disclosure - Subsequent events link:presentationLink link:calculationLink link:definitionLink 2430401 - Disclosure - Subsequent events (Details) link:presentationLink link:calculationLink link:definitionLink 2101100 - Disclosure - Summary of business and significant accounting policies link:presentationLink link:calculationLink link:definitionLink 2401402 - Disclosure - Summary of business and significant accounting policies (Details) link:presentationLink link:calculationLink link:definitionLink 2201201 - Disclosure - Summary of business and significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink