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Disclosure - Net Loss Per Share Attributable to Common Stockholders - Basic and diluted net loss per share attributable to common stockholders (Details) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - Net Loss Per Share Attributable to Common Stockholders - Antidilutive effect (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Stock-Based Compensation - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Stock-Based Compensation - Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Stock-Based Compensation - Stock option activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Stock-Based Compensation - Share-based compensation expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Commitments and Contingencies - 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