Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |
1 Months Ended | 9 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2020 |
Aug. 31, 2020 |
Jun. 30, 2020 |
Jun. 19, 2020 |
Apr. 24, 2020 |
Oct. 31, 2018 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Apr. 30, 2020 |
Apr. 30, 2019 |
Dec. 31, 2018 |
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| Equity (Details) [Line Items] | |||||||||||
| Equity description | In August 2020, the Company entered into the Capital on Demand™ Sales Agreement with JonesTrading Institutional Services LLC (“JonesTrading”), pursuant to which the Company may sell, from time to time, through or to JonesTrading, up to an aggregate of $200 million of its common stock. Shares of common stock are offered pursuant to the Company’s shelf registration statement on Form S-3 filed with the SEC on August 7, 2020. | the Company issued and sold 1.9 million shares of common stock and 0.7 million pre-funded warrants to purchase shares of common stock. The price to the public in this offering for each share of common stock was $9.75 and for each pre-funded warrant was $9.747. Each pre-funded warrant has an exercise price of $0.003 per share and is exercisable immediately upon issuance. The pre-funded warrants are subject to certain limitations on beneficial ownership. Gross proceeds from this offering to Actinium were $25.0 million, before deducting underwriting discounts and commissions and other offering expenses payable by the Company. Net proceeds from this offering were $23.0 million. | the Company issued and sold 4.3 million shares of common stock and 2.8 million pre-funded warrants to purchase shares of common stock. The price to the public in this offering for each share of common stock was $4.50 and for each pre-funded warrant was $4.497. Each pre-funded warrant has an exercise price of $0.003 per share and is exercisable immediately upon issuance. The pre-funded warrants are subject to certain limitations on beneficial ownership. Gross proceeds from this offering to Actinium were $31.6 million, before deducting underwriting discounts and commissions and other offering expenses payable by the Company. Net proceeds from this offering were $29.1 million. During the nine months ended September 30, 2020, holders of 1.4 million pre-funded April 2020 warrants exercised their warrants at $0.003 per share and received 1.4 million shares of common stock. On June 19, 2020, the Company issued and sold 1.9 million shares of common stock and 0.7 million pre-funded warrants to purchase shares of common stock. The price to the public in this offering for each share of common stock was $9.75 and for each pre-funded warrant was $9.747. Each pre-funded warrant has an exercise price of $0.003 per share and is exercisable immediately upon issuance. The pre-funded warrants are subject to certain limitations on beneficial ownership. | ||||||||
| Proceeds from issuance of common stock | $ 200,000 | ||||||||||
| Exercise price of warrants | $ 15.00 | ||||||||||
| Shares of common stock | 2,000 | ||||||||||
| Sale of common stock, shares | 300,000 | ||||||||||
| Net proceeds on sale of common stock | $ 2,500 | ||||||||||
| Aggregate value of common stock, shares over life of agreement | 2,600 | ||||||||||
| Equity description | In June 2020, the Company issued 5 thousand shares of restricted common stock, valued at $30 thousand, for consulting services. | ||||||||||
| Dividend to common stockholders | $ 1 | ||||||||||
| Expected term | 6 years | ||||||||||
| Cancellation of shares | 20 | ||||||||||
| unrecognized compensation expense | $ 3,700 | ||||||||||
| Weighted average expected term | 3 years 146 days | ||||||||||
| Compensation expense related to stock options | $ 800 | $ 900 | |||||||||
| Stock Options [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Share-based compensation arrangement by share-based payment award, option, grants in period, gross | 400,000 | ||||||||||
| Maximum [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Exercise price of stock option | $ 17.70 | $ 17.70 | |||||||||
| Vesting period | 10 years | ||||||||||
| Discount rate | 0.41% | ||||||||||
| Expected volatility rate | 84.70% | ||||||||||
| Minimum [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Exercise price of stock option | $ 9.55 | $ 9.55 | |||||||||
| Vesting period | 4 years | ||||||||||
| Discount rate | 0.34% | ||||||||||
| Expected volatility rate | 83.60% | ||||||||||
| Series A warrants [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Received amount | $ 1,500 | ||||||||||
| Warrants exercised | 83,000 | ||||||||||
| Warrant [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Sale of common stock | 1,900,000 | ||||||||||
| Warrant to purchase of common stock | 700,000 | ||||||||||
| Share price | $ 9.747 | ||||||||||
| Exercise price of warrants | $ 0.003 | ||||||||||
| Gross proceeds | $ 25,000 | ||||||||||
| Net proceeds of public offering | $ 23,000 | ||||||||||
| Description of pre-funded warrants | During the nine months ended September 30, 2020, holders of 0.2 million pre-funded June 2020 warrants exercised their warrants at $0.003 per share and received 0.2 million shares of common stock and holders of April 2019 warrants exercised their warrants at $15.00 per share and received 2 thousand shares of common stock. | ||||||||||
| Warrant [Member] | Maximum [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Exercise price of warrants | $ 26.40 | $ 26.40 | $ 37.50 | ||||||||
| Warrant [Member] | Minimum [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Exercise price of warrants | $ 15.61515 | $ 15.61515 | $ 26.40 | ||||||||
| Common Stock [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Share price | $ 9.75 | ||||||||||
| Lincoln Park Capital Fund, LLC [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Sale of common stock, shares | 27,000 | ||||||||||
| Received amount | $ 200 | ||||||||||
| Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] | |||||||||||
| Equity (Details) [Line Items] | |||||||||||
| Aggregate value of common stock, shares over life of agreement | $ 32,500 | ||||||||||