Significant Accounting Policies	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Risks and Uncertainties The Company is monitoring the potential impact of COVID-19, if any, on the carrying value of certain assets and its continued operations. To date, the Company has not experienced material business disruption, nor has it incurred impairment of any assets as a result of COVID-19. The extent to which these events may impact the Company’s business, clinical development and regulatory efforts, and the value of its common stock, will depend on future developments, which are highly uncertain and cannot be predicted at this time. The duration and intensity of these impacts and resulting disruption to the Company’s operations is uncertain and the Company will continue to assess for any future potential financial impact, if any. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Principles of Consolidation The condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Financial Instruments and Concentrations of Credit Risk Cash and cash equivalents, receivables, and accounts payable are recorded at cost, which approximates fair value based on the short-term nature of these financial instruments. The Company is unable to estimate the fair value of the royalty obligation based on future product sales, as the timing of payments, if any, is uncertain. Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents. Cash and cash equivalents are held by financial institutions and are federally insured up to certain limits. At times, the Company’s cash and cash equivalents balance exceeds the federally insured limits. To limit the credit risk, the Company invests its excess cash primarily in high quality securities such as money market funds. Share-Based Compensation The Company is required to estimate the grant-date fair value of share-based payment transactions with employees which include stock options, restricted stock units ("RSUs") and performance shares and recognizes the compensation cost over the requisite service period based on the estimated fair values. The Company estimates the fair value of each award granted using the Black-Scholes option pricing model. The Black-Scholes model requires the input of assumptions, including the expected stock price volatility, the calculation of expected term and the fair value of the underlying common stock on the date of grant, among other inputs. The Company calculates the fair value of the award on the grant date, which is the date the award is authorized by the Board or by the Chief Executive Officer as delegated by the Board. The Company has issued awards to nonemployee consultants and advisers. All grants to nonemployees are valued using the same fair value method that we use for grants to employees. The compensation cost on these awards is measured each period until vesting and is recognized through the earlier of the vesting of the award or completion of services by the nonemployee. Following is a description of the inputs for the Black-Scholes model: Exercise Price The Company uses the quoted market price as listed on the public exchange on the date of grant. If incentive stock options are granted to a 10% stockholder in the Company, the exercise price shall not be less than 110% of the common stock’s fair market value on the date of grant. Expected Term (in Years) The expected term of a stock option is the period of time for which the option is expected to be outstanding. Due to the lack of historical exercise data to provide a reasonable basis upon which to estimate an expected term, we have opted to use the simplified method, which is the use of the midpoint of the vesting term and the contractual term of the award to estimate the expected term. Risk-Free Interest Rate The Company uses the average yield on current U.S. Treasury instruments with terms that approximate the expected term of the stock options being valued. Expected Dividend Yield The expected dividend yield for all of the Company’s stock option grants is 0%, as the Company has not declared a cash dividend since inception and has no plans to declare a dividend. Expected Volatility As the Company does not have sufficient historical stock price information to meet the expected life of the stock option grants, it uses a blended volatility based on the trading history from the common stock of a set of comparable publicly-traded biopharmaceutical companies. Forfeitures The Company accounts for forfeitures as they occur. Property and Equipment Property and equipment are capitalized as the Company believes they have alternative future uses and are stated at cost, less accumulated depreciation of $161,000 and $154,000 as of March 31, 2020 and December 31, 2019, respectively. Depreciation on all property and equipment is calculated on the straight-line method over the shorter of the lease term or estimated useful life of the asset. Computer equipment has useful lives of three to five years, lab equipment has a useful life of five years, and contract manufacturing organization equipment has a useful life of five years. Acquired In-process Research and Development Acquired in-process research and development expense consists of the initial up-front payments incurred in connection with the acquisition or licensing of product candidates that do not meet the definition of a business under ASC 805, Business Combinations. During the three months ended March 31, 2020, the Company expensed the in-process research and development asset of $426,000 acquired as part of the Merger as there is no future economic benefit. The expense of $426,000 is recorded within research and development costs within the Consolidated Statement of Operations. Asset Held for Sale An asset is considered to be held for sale when all of the following criteria are met: (i) management commits to a plan to sell the asset; (ii) it is unlikely that the disposal plan will be significantly modified or discontinued; (iii) the asset is available for immediate sale in its present condition; (iv) actions required to complete the sale of the asset have been initiated; (v) sale of the asset is probable and the completed sale is expected to occur within one year; and (vi) the asset is actively being marketed for sale at a price that is reasonable given its current market value. A long-lived asset classified as held for sale is measured at the lower of its carrying amount or fair value less cost to sell. If the long-lived asset is newly acquired, the carrying amount of the long-lived asset is established based on its fair value less cost to sell at the acquisition date. A long-lived asset is not depreciated or amortized while it is classified as held for sale, and an impairment loss would be recognized to the extent the carrying amount exceeds the asset's fair value less cost to sell. Lumos has classified the PRV as held for sale and is carried at its original fair value less cost to sell on the condensed consolidated balance sheet as of March 31, 2020.

The Company is monitoring the potential impact of COVID-19, if any, on the carrying value of certain assets and its continued operations. To date, the Company has not experienced material business disruption, nor has it incurred impairment of any assets as a result of COVID-19. The extent to which these events may impact the Company’s business, clinical development and regulatory efforts, and the value of its common stock, will depend on future developments, which are highly uncertain and cannot be predicted at this time. The duration and intensity of these impacts and resulting disruption to the Company’s operations is uncertain and the Company will continue to assess for any future potential financial impact, if any.

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Cash and cash equivalents, receivables, and accounts payable are recorded at cost, which approximates fair value based on the short-term nature of these financial instruments. The Company is unable to estimate the fair value of the royalty obligation based on future product sales, as the timing of payments, if any, is uncertain.

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents. Cash and cash equivalents are held by financial institutions and are federally insured up to certain limits. At times, the Company’s cash and cash equivalents balance exceeds the federally insured limits. To limit the credit risk, the Company invests its excess cash primarily in high quality securities such as money market funds.

The Company is required to estimate the grant-date fair value of share-based payment transactions with employees which include stock options, restricted stock units ("RSUs") and performance shares and recognizes the compensation cost over the requisite service period based on the estimated fair values. The Company estimates the fair value of each award granted using the Black-Scholes option pricing model. The Black-Scholes model requires the input of assumptions, including the expected stock price volatility, the calculation of expected term and the fair value of the underlying common stock on the date of grant, among other inputs. The Company calculates the fair value of the award on the grant date, which is the date the award is authorized by the Board or by the Chief Executive Officer as delegated by the Board.

The Company has issued awards to nonemployee consultants and advisers. All grants to nonemployees are valued using the same fair value method that we use for grants to employees. The compensation cost on these awards is measured each period until vesting and is recognized through the earlier of the vesting of the award or completion of services by the nonemployee.

The Company uses the quoted market price as listed on the public exchange on the date of grant. If incentive stock options are granted to a 10% stockholder in the Company, the exercise price shall not be less than 110% of the common stock’s fair market value on the date of grant.

The expected term of a stock option is the period of time for which the option is expected to be outstanding. Due to the lack of historical exercise data to provide a reasonable basis upon which to estimate an expected term, we have opted to use the simplified method, which is the use of the midpoint of the vesting term and the contractual term of the award to estimate the expected term.

The expected dividend yield for all of the Company’s stock option grants is 0%, as the Company has not declared a cash dividend since inception and has no plans to declare a dividend.

As the Company does not have sufficient historical stock price information to meet the expected life of the stock option grants, it uses a blended volatility based on the trading history from the common stock of a set of comparable publicly-traded biopharmaceutical companies.

Property and equipment are capitalized as the Company believes they have alternative future uses and are stated at cost, less accumulated depreciation of $161,000 and $154,000 as of March 31, 2020 and December 31, 2019, respectively. Depreciation on all property and equipment is calculated on the straight-line method over the shorter of the lease term or estimated useful life of the asset. Computer equipment has useful lives of three to five years, lab equipment has a useful life of five years, and contract manufacturing organization equipment has a useful life of five years.

Acquired in-process research and development expense consists of the initial up-front payments incurred in connection with the acquisition or licensing of product candidates that do not meet the definition of a business under ASC 805, Business Combinations. During the three months ended March 31, 2020, the Company expensed the in-process research and development asset of $426,000 acquired as part of the Merger as there is no future economic benefit. The expense of $426,000 is recorded within research and development costs within the Consolidated Statement of Operations.

An asset is considered to be held for sale when all of the following criteria are met: (i) management commits to a plan to sell the asset; (ii) it is unlikely that the disposal plan will be significantly modified or discontinued; (iii) the asset is available for immediate sale in its present condition; (iv) actions required to complete the sale of the asset have been initiated; (v) sale of the asset is probable and the completed sale is expected to occur within one year; and (vi) the asset is actively being marketed for sale at a price that is reasonable given its current market value.

A long-lived asset classified as held for sale is measured at the lower of its carrying amount or fair value less cost to sell. If the long-lived asset is newly acquired, the carrying amount of the long-lived asset is established based on its fair value less cost to sell at the acquisition date. A long-lived asset is not depreciated or amortized while it is classified as held for sale, and an impairment loss would be recognized to the extent the carrying amount exceeds the asset's fair value less cost to sell.

Lumos has classified the PRV as held for sale and is carried at its original fair value less cost to sell on the condensed consolidated balance sheet as of March 31, 2020.