Business Organization and Presentation	9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Organization and Presentation	Business Organization and Presentation Business organization Vanda Pharmaceuticals Inc. (the Company) is a leading global biopharmaceutical company focused on the development and commercialization of innovative therapies to address high unmet medical needs and improve the lives of patients. The Company commenced its operations in 2003 and operates in one reporting segment. The Company’s commercial portfolio is currently comprised of two products, HETLIOZ® for the treatment of Non-24-Hour Sleep-Wake Disorder (Non-24) and Fanapt® for the treatment of schizophrenia. HETLIOZ® is the first treatment for Non-24 approved by the U.S. Food and Drug Administration (FDA). In addition, the Company has a number of drugs in development, including: •HETLIOZ® (tasimelteon) for the treatment of Smith-Magenis Syndrome (SMS), jet lag disorder (JLD), pediatric Non-24 and delayed sleep phase disorder (DSPD); •Fanapt® (iloperidone) for the treatment of bipolar disorder and a long acting injectable (LAI) formulation for the treatment of schizophrenia; •Tradipitant (VLY-686), a small molecule neurokinin-1 receptor (NK-1R) antagonist, for the treatment of atopic dermatitis, gastroparesis, motion sickness and COVID-19 pneumonia; •VTR-297, a small molecule histone deacetylase (HDAC) inhibitor for the treatment of hematologic malignancies and with potential use as a treatment for several oncology indications; •VQW-765, a small molecule nicotinic acetylcholine receptor partial agonist, with potential use for the treatment of psychiatric disorders; and •Portfolio of Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) activators and inhibitors for the treatment of dry eye and ocular inflammation and for the treatment of secretory diarrhea disorders, including cholera. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Company’s consolidated financial statements and accompanying notes included in the Company's annual report on Form 10-K (Annual Report) for the fiscal year ended December 31, 2019. The financial information as of September 30, 2020 and for the three and nine months ended September 30, 2020 and 2019 is unaudited, but in the opinion of management, all adjustments considered necessary for a fair statement of the results for these interim periods have been included. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated balance sheet data as of December 31, 2019 was derived from audited financial statements but does not include all disclosures required by GAAP. The results of the Company’s operations for any interim period are not necessarily indicative of the results that may be expected for any other interim period or any future year or period.

Business Organization and Presentation

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business organization

Vanda Pharmaceuticals Inc. (the Company) is a leading global biopharmaceutical company focused on the development and commercialization of innovative therapies to address high unmet medical needs and improve the lives of patients. The Company commenced its operations in 2003 and operates in one reporting segment.

The Company’s commercial portfolio is currently comprised of two products, HETLIOZ® for the treatment of Non-24-Hour Sleep-Wake Disorder (Non-24) and Fanapt® for the treatment of schizophrenia. HETLIOZ® is the first treatment for Non-24 approved by the U.S. Food and Drug Administration (FDA). In addition, the Company has a number of drugs in development, including:

•HETLIOZ® (tasimelteon) for the treatment of Smith-Magenis Syndrome (SMS), jet lag disorder (JLD), pediatric Non-24 and delayed sleep phase disorder (DSPD);

•Fanapt® (iloperidone) for the treatment of bipolar disorder and a long acting injectable (LAI) formulation for the treatment of schizophrenia;

•Tradipitant (VLY-686), a small molecule neurokinin-1 receptor (NK-1R) antagonist, for the treatment of atopic dermatitis, gastroparesis, motion sickness and COVID-19 pneumonia;

•VTR-297, a small molecule histone deacetylase (HDAC) inhibitor for the treatment of hematologic malignancies and with potential use as a treatment for several oncology indications;

•VQW-765, a small molecule nicotinic acetylcholine receptor partial agonist, with potential use for the treatment of psychiatric disorders; and

•Portfolio of Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) activators and inhibitors for the treatment of dry eye and ocular inflammation and for the treatment of secretory diarrhea disorders, including cholera.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Company’s consolidated financial statements and accompanying notes included in the Company's annual report on Form 10-K (Annual Report) for the fiscal year ended December 31, 2019. The financial information as of September 30, 2020 and for the three and nine months ended September 30, 2020 and 2019 is unaudited, but in the opinion of management, all adjustments considered necessary for a fair statement of the results for these interim periods have been included. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated balance sheet data as of December 31, 2019 was derived from audited financial statements but does not include all disclosures required by GAAP. The results of the Company’s operations for any interim period are not necessarily indicative of the results that may be expected for any other interim period or any future year or period.