Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
Oct. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the applicable rules and regulations of the SEC for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The condensed consolidated balance sheet at July 31, 2017 has been derived from the audited consolidated financial statements at that date, but does not include all disclosures, including notes, required by GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to present fairly the Company's financial position as of October 31, 2017 and July 31, 2017, results of its operations for the three months ended October 31, 2017 and 2016 and cash flows for the three months ended October 31, 2017 and 2016. The interim results are not necessarily indicative of the results for any future interim period or for the entire year. Certain prior period amounts have been reclassified to conform to current period presentation. These classifications have no effect on the previously reported net loss of loss per share. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary, Opiant Pharmaceuticals UK Limited, a company incorporated on November 4, 2016 under the England and Wales Companies Act of 2006. Intercompany balances and transactions are eliminated upon consolidation. The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended July 31, 2017 included in the Company's Annual Report on Form 10-K filed with the SEC on October 13, 2017. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and reported amounts of expenses in the financial statements and accompanying notes. Actual results could differ from those estimates. Key estimates included in the financial statements include the valuation of: deferred income tax assets, liability and equity instruments, stock-based compensation, acquired intangibles, contingent earn-out consideration, and allowances for accounts receivable and inventory. Going Concern Assessment With the implementation of the Financial Accounting Standards Board's new standard on going concern, Accounting Standard Update, or ASU No. 2014-15, beginning with the year ended July 31, 2017 and all annual and interim periods thereafter, the Company will assess going concern uncertainty in its financial statements to determine if it has sufficient cash on hand and working capital, including available borrowings on loans, to operate for a period of at least one year from the date the financial statements are issued or available to be issued, which is referred to as the “look-forward period” as defined by ASU No. 2014-15. As part of this assessment, based on conditions that are known and reasonably knowable to the Company, the Company will consider various scenarios, forecasts, projections, estimates and will make certain key assumptions, including the timing and nature of projected cash expenditures or programs, and its ability to delay or curtail expenditures or programs, if necessary, among other factors. Based on this assessment, as necessary or applicable, the Company makes certain assumptions around implementing curtailments or delays in the nature and timing of programs and expenditures to the extent it deems probable those implementations can be achieved and it has the proper authority to execute them within the look-forward period in accordance with ASU No. 2014-15. Based upon the above assessment, we believe that we have sufficient capital resources to sustain operations through at least the next 12 months from the date of the filing of this Report. Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents were approximately $5.9 million and $6.9 million at October 31, 2017 and July 31, 2017, respectively. The Company maintains cash balances at financial institutions insured up to $250 thousand by the Federal Deposit Insurance Corporation. Balances in the UK are insured up to £85 thousand by the Financial Services Compensation Scheme (UK Equivalent). Although the Company’s cash balances exceeded these insured amounts at various times during the three months ended October 31, 2017, the Company has not experienced any losses on its deposits of cash and cash equivalents for the periods presented. Recently Issued Accounting Pronouncements The Company has implemented all new accounting pronouncements that are in effect and that may impact its financial statements and does not believe that there are any other new pronouncements that have been issued that might have a material impact on its financial position or results of operations.

Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the applicable rules and regulations of the SEC for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The condensed consolidated balance sheet at July 31, 2017 has been derived from the audited consolidated financial statements at that date, but does not include all disclosures, including notes, required by GAAP for complete financial statements.

The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to present fairly the Company's financial position as of October 31, 2017 and July 31, 2017, results of its operations for the three months ended October 31, 2017 and 2016 and cash flows for the three months ended October 31, 2017 and 2016. The interim results are not necessarily indicative of the results for any future interim period or for the entire year. Certain prior period amounts have been reclassified to conform to current period presentation. These classifications have no effect on the previously reported net loss of loss per share.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary, Opiant Pharmaceuticals UK Limited, a company incorporated on November 4, 2016 under the England and Wales Companies Act of 2006. Intercompany balances and transactions are eliminated upon consolidation.

The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended July 31, 2017 included in the Company's Annual Report on Form 10-K filed with the SEC on October 13, 2017.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and reported amounts of expenses in the financial statements and accompanying notes. Actual results could differ from those estimates. Key estimates included in the financial statements include the valuation of: deferred income tax assets, liability and equity instruments, stock-based compensation, acquired intangibles, contingent earn-out consideration, and allowances for accounts receivable and inventory.

Going Concern Assessment

With the implementation of the Financial Accounting Standards Board's new standard on going concern, Accounting Standard Update, or ASU No. 2014-15, beginning with the year ended July 31, 2017 and all annual and interim periods thereafter, the Company will assess going concern uncertainty in its financial statements to determine if it has sufficient cash on hand and working capital, including available borrowings on loans, to operate for a period of at least one year from the date the financial statements are issued or available to be issued, which is referred to as the “look-forward period” as defined by ASU No. 2014-15. As part of this assessment, based on conditions that are known and reasonably knowable to the Company, the Company will consider various scenarios, forecasts, projections, estimates and will make certain key assumptions, including the timing and nature of projected cash expenditures or programs, and its ability to delay or curtail expenditures or programs, if necessary, among other factors. Based on this assessment, as necessary or applicable, the Company makes certain assumptions around implementing curtailments or delays in the nature and timing of programs and expenditures to the extent it deems probable those implementations can be achieved and it has the proper authority to execute them within the look-forward period in accordance with ASU No. 2014-15.

Based upon the above assessment, we believe that we have sufficient capital resources to sustain operations through at least the next 12 months from the date of the filing of this Report.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents were approximately $5.9 million and $6.9 million at October 31, 2017 and July 31, 2017, respectively. The Company maintains cash balances at financial institutions insured up to $250 thousand by the Federal Deposit Insurance Corporation. Balances in the UK are insured up to £85 thousand by the Financial Services Compensation Scheme (UK Equivalent). Although the Company’s cash balances exceeded these insured amounts at various times during the three months ended October 31, 2017, the Company has not experienced any losses on its deposits of cash and cash equivalents for the periods presented.

Recently Issued Accounting Pronouncements

The Company has implemented all new accounting pronouncements that are in effect and that may impact its financial statements and does not believe that there are any other new pronouncements that have been issued that might have a material impact on its financial position or results of operations.