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Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 20, 2020 | Jul. 31, 2020 | Jun. 19, 2020 | Apr. 24, 2020 | Oct. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Equity (Textual) |  |  |  |  |  |  |  |  |
Sale of common stock, shares |  |  |  |  |  | 300,000 |  |  |
Net proceeds on sale of common stock |  |  |  |  |  | $ 2,500 |  |  |
Warrant to purchase of common stock |  |  |  |  |  | 1,907 |  |  |
Share cancelled due to termination of employees |  |  |  |  |  | 400 |  |  |
Compensation expense related to stock options |  |  |  |  |  | $ 500 | $ 300 |  |
Unrecognized compensation expense |  |  |  |  |  | $ 1,500 |  |  |
Description of pre-funded warrants |  |  |  |  |  | Holders of 1.2 million pre-funded April 2020 warrants exercised their warrants at $0.003 per share and received 1.2 million shares of common stock. |  |  |
Weighted average remaining contractual term |  |  |  |  |  | 2 years 9 months 18 days |  |  |
Subsequent event, description |  |  |  | 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. |  | The Company issued 5 thousand shares of restricted common stock, valued at $30 thousand, for consulting services. |  |  |
Dividend to common stockholders |  |  |  |  |  | $ 1 | 1 |  |
Employees [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  | 357,189 |  |  |
Non Employees [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  | 33,332 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Description of pre-funded warrants |  | Holders of 0.4 million pre-funded April 2020 and June 2020 warrants exercised their warrants at $0.003 per share and received 0.4 million shares of common stock. Holders of 2 thousand April 2019 warrants exercised their warrants at $15.00 per share and received 2 thousand shares. |  |  |  |  |  |  |
Subsequent event, description | The Company filed a registration statement including a base prospectus which covers the offering, issuance and sale of up to $500 million of common stock, preferred stock, warrants, units and/or subscription rights; and a sales agreement prospectus covering the offering, issuance and sale of up to a maximum aggregate offering price of $200 million of common stock that may be issued and sold under the Capital on Demand™ Sales Agreement with JonesTrading Institutional Services LLC. |  |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Received amount |  |  |  |  |  |  | $ 1,500 |  |
Warrants exercised |  |  |  |  |  |  | 83,000 |  |
Warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Exercise price of warrant |  |  |  |  |  | $ 15.60 |  | $ 15.60 | $ 26.40
Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Exercise price of warrant |  |  |  |  |  | $ 26.40 |  | $ 26.40 | $ 37.50
Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Received amount |  |  |  |  |  | $ 200 |  |  |
Sale of common stock, shares |  |  |  |  |  | 27,000 |  |  |
Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Aggregate value of common stock, shares over life of agreement |  |  |  |  | $ 32,500 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Share price |  |  | $ 9.75 |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  | 1,900,000 |  |  |  |  |  |
Share price |  |  | $ 9.747 |  |  |  |  |  |
Warrant to purchase of common stock |  |  | 700,000 |  |  |  |  |  |
Warrants exercised |  |  | 0.003 |  |  |  |  |  |
Net proceeds of public offering |  |  | $ 23,000 |  |  |  |  |  |
Gross proceeds |  |  | $ 25,000 |  |  |  |  |  |

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