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CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Nano Tx Therapeutics [Member] | Series C Convertible Preferred Stock [Member] | Convertible Preferred Stock [Member] | Convertible Preferred Stock [Member] Series B Convertible Preferred Stock [Member] | Convertible Preferred Stock [Member] Series B and C Convertible Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] Nano Tx Therapeutics [Member] | Common Stock [Member] Series B Convertible Preferred Stock [Member] | Common Stock [Member] Series B and C Convertible Preferred Stock [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Nano Tx Therapeutics [Member] | Additional Paid-in Capital [Member] Series C Convertible Preferred Stock [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Deficit [Member]
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Balance at Dec. 31, 2018 | $ 5,225 |  |  |  |  |  |  |  |  |  | $ 418,390 |  |  | $ 1,218 | $ (414,383)
Balance (in shares) at Dec. 31, 2018 |  |  |  | 4,606,000 |  |  | 296,609,000 |  |  |  |  |  |  |  |
Share-based compensation | 49 |  |  |  |  |  |  |  |  |  | 49 |  |  |  |
Sale of common stock, net | 1,873 |  |  |  |  |  |  |  |  |  | 1,873 |  |  |  |
Sale of common stock, net (in shares) |  |  |  |  |  |  | 139,855,000 |  |  |  |  |  |  |  |
Conversion of Convertible Preferred Stock into common stock (share) |  |  |  |  | (66,000) |  |  |  | 1,653,000 |  |  |  |  |  |
Foreign currency translation adjustment and accumulated other comprehensive income | (140) |  |  |  |  |  |  |  |  |  |  |  |  | (140) |
Net income (loss) | (3,150) |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,150)
Balance at Mar. 31, 2019 | 3,857 |  |  |  |  |  |  |  |  |  | 420,312 |  |  | 1,078 | (417,533)
Balance (in shares) at Mar. 31, 2019 |  |  |  | 4,540,000 |  |  | 438,117,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 5,225 |  |  |  |  |  |  |  |  |  | 418,390 |  |  | 1,218 | (414,383)
Balance (in shares) at Dec. 31, 2018 |  |  |  | 4,606,000 |  |  | 296,609,000 |  |  |  |  |  |  |  |
Net income (loss) | (11,771) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 | 160 |  |  |  |  |  | $ 3 |  |  |  | 426,311 |  |  |  | (426,154)
Balance (in shares) at Sep. 30, 2019 |  |  |  | 1,959,000 |  |  | 2,841,588,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 5,225 |  |  |  |  |  |  |  |  |  | 418,390 |  |  | 1,218 | (414,383)
Balance (in shares) at Dec. 31, 2018 |  |  |  | 4,606,000 |  |  | 296,609,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 1,160 |  |  |  |  |  | $ 4 |  |  |  | 426,426 |  |  |  | (425,270)
Balance (in shares) at Dec. 31, 2019 | 3,880,588 |  |  | 1,959,000 |  |  | 3,880,588,000 |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 | $ 3,857 |  |  |  |  |  |  |  |  |  | 420,312 |  |  | 1,078 | (417,533)
Balance (in shares) at Mar. 31, 2019 |  |  |  | 4,540,000 |  |  | 438,117,000 |  |  |  |  |  |  |  |
Share-based compensation | 28 |  |  |  |  |  |  |  |  |  | 28 |  |  |  |
Sale of common stock, net | 64 |  |  |  |  |  |  |  |  |  | 64 |  |  |  |
Sale of common stock, net (in shares) |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Foreign currency translation adjustment and accumulated other comprehensive income | (1,078) |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,078) |
Net income (loss) | (9,147) |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,147)
Balance at Jun. 30, 2019 | (6,276) |  |  |  |  |  |  |  |  |  | 420,404 |  |  |  | (426,680)
Balance (in shares) at Jun. 30, 2019 |  |  |  | 4,540,000 |  |  | 443,117,000 |  |  |  |  |  |  |  |
Issuance of common stock for exercise of warrants | 490 |  |  |  |  |  |  |  |  |  | 490 |  |  |  |
Issuance of common stock for exercise of warrants (in shares) |  |  |  |  |  |  | 65,415,000 |  |  |  |  |  |  |  |
Reclassification of warrant liabilities | 794 |  |  |  |  |  |  |  |  |  | 794 |  |  |  |
Share-based compensation | 29 |  |  |  |  |  |  |  |  |  | 29 |  |  |  |
Sale of common stock and pre-funded warrants, net of offering costs | 4,597 |  |  |  |  |  | $ 3 |  |  |  | 4,594 |  |  |  |
Sale of common stock and pre-funded warrants, net of offering costs (in shares) |  |  |  |  |  |  | 2,000,510,000 |  |  |  |  |  |  |  |
Conversion of Convertible Preferred Stock into common stock (share) |  |  |  |  |  | (2,581,000) |  |  |  | 332,546,000 |  |  |  |  |
Exercise of warrants (in shares) |  |  |  |  |  |  | 65,415,000 |  |  |  |  |  |  |  |
Beneficial conversion feature related to Series C Convertible Preferred Stock |  |  | $ 554 |  |  |  |  |  |  |  |  |  | $ 554 |  |
Accretion of beneficial conversion feature related to Series C Convertible Preferred Stock |  |  | $ (554) |  |  |  |  |  |  |  |  |  | $ (554) |  |
Net income (loss) | 526 |  |  |  |  |  |  |  |  |  |  |  |  |  | 526
Balance at Sep. 30, 2019 | 160 |  |  |  |  |  | $ 3 |  |  |  | 426,311 |  |  |  | (426,154)
Balance (in shares) at Sep. 30, 2019 |  |  |  | 1,959,000 |  |  | 2,841,588,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 1,160 |  |  |  |  |  | $ 4 |  |  |  | 426,426 |  |  |  | (425,270)
Balance (in shares) at Dec. 31, 2019 | 3,880,588 |  |  | 1,959,000 |  |  | 3,880,588,000 |  |  |  |  |  |  |  |
Share-based compensation | $ 12 |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Net income (loss) | (1,087) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,087)
Balance at Mar. 31, 2020 | 85 |  |  |  |  |  | $ 4 |  |  |  | 426,438 |  |  |  | (426,357)
Balance (in shares) at Mar. 31, 2020 |  |  |  | 1,959,000 |  |  | 3,880,588,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 1,160 |  |  |  |  |  | $ 4 |  |  |  | 426,426 |  |  |  | (425,270)
Balance (in shares) at Dec. 31, 2019 | 3,880,588 |  |  | 1,959,000 |  |  | 3,880,588,000 |  |  |  |  |  |  |  |
Net income (loss) | $ (4,654) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2020 | $ 2,621 |  |  |  |  |  | $ 5 |  |  |  | 432,540 |  |  |  | (429,924)
Balance (in shares) at Sep. 30, 2020 | 4,591,415 |  |  | 1,954,000 |  |  | 4,591,415,000 |  |  |  |  |  |  |  |
Balance at Mar. 31, 2020 | $ 85 |  |  |  |  |  | $ 4 |  |  |  | 426,438 |  |  |  | (426,357)
Balance (in shares) at Mar. 31, 2020 |  |  |  | 1,959,000 |  |  | 3,880,588,000 |  |  |  |  |  |  |  |
Issuance of common stock for exercise of warrants | 366 |  |  |  |  |  |  |  |  |  | 366 |  |  |  |
Issuance of common stock for exercise of warrants (in shares) |  |  |  |  |  |  | 162,500,000 |  |  |  |  |  |  |  |
Reclassification of warrant liabilities | 4,264 |  |  |  |  |  |  |  |  |  | 4,264 |  |  |  |
Issuance of common stock for in process research and development acquired |  | $ 381 |  |  |  |  |  |  |  |  |  | $ 381 |  |  |
Issuance of common stock for in process research and development acquired (in share) |  |  |  |  |  |  |  | 230,769,000 |  |  |  |  |  |  |
Share-based compensation | 43 |  |  |  |  |  |  |  |  |  | 43 |  |  |  |
Exercise of warrants (in shares) |  |  |  |  |  |  | 162,500,000 |  |  |  |  |  |  |  |
Net income (loss) | (1,839) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,839)
Balance at Jun. 30, 2020 | 3,300 |  |  |  |  |  | $ 4 |  |  |  | 431,492 |  |  |  | (428,196)
Balance (in shares) at Jun. 30, 2020 |  |  |  | 1,959,000 |  |  | 4,273,857,000 |  |  |  |  |  |  |  |
Issuance of common stock for exercise of warrants | 715 |  |  |  |  |  | $ 1 |  |  |  | 714 |  |  |  |
Issuance of common stock for exercise of warrants (in shares) |  |  |  |  |  |  | 317,521,000 |  |  |  |  |  |  |  |
Reclassification of warrant liabilities | 240 |  |  |  |  |  |  |  |  |  | 240 |  |  |  |
Share-based compensation | 94 |  |  |  |  |  |  |  |  |  | 94 |  |  |  |
Conversion of Convertible Preferred Stock into common stock (share) |  |  |  |  | (5,000) |  |  |  | 37,000 |  |  |  |  |  |
Exercise of warrants (in shares) |  |  |  |  |  |  | 317,521,000 |  |  |  |  |  |  |  |
Net income (loss) | (1,728) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,728)
Balance at Sep. 30, 2020 | $ 2,621 |  |  |  |  |  | $ 5 |  |  |  | $ 432,540 |  |  |  | $ (429,924)
Balance (in shares) at Sep. 30, 2020 | 4,591,415 |  |  | 1,954,000 |  |  | 4,591,415,000 |  |  |  |  |  |  |  |

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