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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Predecessor | Successor | Common Stock Predecessor | Common Stock Successor | Additional Paid-In Capital Predecessor | Additional Paid-In Capital Successor | Deficit Accumulated During Development Stage Successor | Treasury Stock Successor | Parent Company's Net Deficit Predecessor
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2003 |  | $ (89) |  | $ 0 |  | $ 0 |  |  |  | $ (89)
Beginning balance, shares at Dec. 31, 2003 |  |  |  | 0 |  |  |  |  |  |
Net loss |  | (3,272) |  |  |  |  |  |  |  | (3,272)
Net transactions with Parent |  | 2,393 |  |  |  |  |  |  |  | 2,393
Ending balance at Dec. 31, 2004 |  | (968) |  | 0 |  | 0 |  |  |  | (968)
Ending balance, shares at Dec. 31, 2004 |  |  |  | 0 |  |  |  |  |  |
Net loss |  | (2,209) |  |  |  |  |  |  |  | (2,209)
Net transactions with Parent |  | 2,727 |  |  |  |  |  |  |  | 2,727
Ending balance at Dec. 31, 2005 |  | (450) |  | 0 |  | 0 |  |  |  | (450)
Ending balance, shares at Dec. 31, 2005 |  |  |  | 0 |  |  |  |  |  |
Net loss |  | (2,405) |  |  |  |  |  |  |  | (2,405)
Net transactions with Parent |  | 2,587 |  |  |  |  |  |  |  | 2,587
Ending balance at Dec. 31, 2006 |  | (268) |  | 0 |  | 0 |  |  | 0 | (268)
Ending balance, shares at Dec. 31, 2006 |  |  |  | 0 |  |  |  |  |  |
Beginning balance at Apr. 03, 2006 |  |  | 0 |  | 0 |  | 0 | 0 | 0 |
Beginning balance, shares at Apr. 03, 2006 |  |  |  |  | 0 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 1,624,278 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 2 |  |  |  | 2 |  |  |
Ending balance at Dec. 31, 2006 |  |  | 2 | 0 | 0 | 0 | 2 | 0 | 0 |
Ending balance, shares at Dec. 31, 2006 |  |  |  | 0 | 1,624,278 |  |  |  |  |
Common stock issued to CytRx for contribution of RXi and other assets, shares |  |  |  |  | 7,040,318 |  |  |  |  |
Common stock issued to CytRx for contribution of RXi and other assets |  |  | 48 |  | 1 |  | 47 |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 3,273,292 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 15,348 |  |  |  | 15,348 |  |  |
Common stock issued to CytRx for reimbursement of expenses, shares |  |  |  |  | 188,387 |  |  |  |  |
Common stock issued to CytRx for reimbursement of expenses |  |  | 978 |  |  |  | 978 |  |  |
Expenses incurred by CytRx for RXi |  |  | 831 |  |  |  | 831 |  |  |
Common stock issued to UMMS for additional intellectual properties, shares |  |  |  |  | 462,112 |  |  |  |  |
Common stock issued to UMMS for additional intellectual properties |  |  | 2,311 |  |  |  | 2,311 |  |  |
Common stock issued to directors, shares |  |  |  |  | 30,000 |  |  |  |  |
Common stock issued to directors |  |  | 150 |  |  |  | 150 |  |  |
Common stock issued upon exercise of stock options, shares |  |  |  |  | 66,045 |  |  |  |  |
Common stock issued upon exercise of stock options |  |  | 331 |  |  |  | 331 |  |  |
Stock based compensation expense for directors and employees |  |  | 1,048 |  |  |  | 1,048 |  |  |
Stock based compensation expense for services |  |  | 766 |  |  |  | 766 |  |  |
Net loss |  |  | (10,990) |  |  |  |  | (10,990) |  |
Ending balance at Dec. 31, 2007 |  |  | 10,823 |  | 1 |  | 21,812 | (10,990) | 0 |
Ending balance, shares at Dec. 31, 2007 |  |  |  |  | 12,684,432 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 1,073,299 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 7,918 |  |  |  | 7,918 |  |  |
Common stock issued upon exercise of stock options, shares |  |  |  |  | 5,500 |  |  |  |  |
Common stock issued upon exercise of stock options |  |  | 26 |  |  |  | 26 |  |  |
Stock based compensation expense for directors and employees |  |  | 2,211 |  |  |  | 2,211 |  |  |
Stock based compensation expense for services |  |  | 1,613 |  |  |  | 1,613 |  |  |
Value of common stock warrants issued (expense) in exchange for services |  |  | 750 |  |  |  | 750 |  |  |
Net loss |  |  | (14,373) |  |  |  |  | (14,373) |  |
Ending balance at Dec. 31, 2008 |  |  | 8,968 |  | 1 |  | 34,330 | (25,363) | 0 |
Ending balance, shares at Dec. 31, 2008 |  |  |  |  | 13,763,231 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 2,385,715 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 7,714 |  | 1 |  | 7,713 |  |  |
Common stock warrants issued in connection with the 2009, 2010 and 2011 offerings |  |  | (2,863) |  |  |  | (2,863) |  |  |
Common stock issued upon exercise of stock options, shares |  |  |  |  | 281 |  |  |  |  |
Common stock issued as commitment fee in connection with SEDA, shares |  |  |  |  | 58,398 |  |  |  |  |
Common stock issued as commitment fee in connection with SEDA |  |  | 281 |  |  |  | 281 |  |  |
Stock based compensation expense for directors and employees |  |  | 2,906 |  |  |  | 2,906 |  |  |
Stock based compensation expense for services |  |  | 1,296 |  |  |  | 1,296 |  |  |
Value of common stock warrants issued (expense) in exchange for services |  |  | 826 |  |  |  | 826 |  |  |
Net loss |  |  | (18,387) |  |  |  |  | (18,387) |  |
Ending balance at Dec. 31, 2009 |  |  | 741 |  | 2 |  | 44,489 | (43,750) | 0 |
Ending balance, shares at Dec. 31, 2009 |  |  |  |  | 16,207,625 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 2,700,000 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 15,235 |  |  |  | 15,235 |  |  |
Purchase of 675,000 shares of treasury stock |  |  | (3,849) |  |  |  |  |  | (3,849) |
Common stock warrants issued in connection with the 2009, 2010 and 2011 offerings |  |  | (2,466) |  |  |  | (2,466) |  |  |
Fair value of shares mandatorily redeemable for cash upon exercise of warrants |  |  | (785) |  |  |  | (785) |  |  |
Common stock issued upon exercise of stock options, shares |  |  |  |  | 53,500 |  |  |  |  |
Common stock issued upon exercise of stock options |  |  | 254 |  |  |  | 254 |  |  |
Issuance of restricted stock units, shares |  |  |  |  | 86,634 |  |  |  |  |
Issuance of restricted stock units |  |  | 207 |  |  |  | 207 |  |  |
Stock based compensation expense for directors and employees |  |  | 3,625 |  |  |  | 3,625 |  |  |
Stock based compensation expense for services |  |  | 743 |  |  |  | 743 |  |  |
Value of common stock warrants issued (expense) in exchange for services |  |  | 718 |  |  |  | 718 |  |  |
Net loss | (11,993) |  | (11,993) |  |  |  |  | (11,993) |  |
Ending balance at Dec. 31, 2010 | 2,430 |  | 2,430 |  | 2 |  | 62,020 | (55,743) | (3,849) |
Ending balance, shares at Dec. 31, 2010 |  |  |  |  | 19,047,759 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) shares |  |  |  |  | 18,650,000 |  |  |  |  |
Issuance of common stock, for cash (net of offering costs of $796, $636, $965 and $1,890 for the period ending 2008 to 2011 respectively) |  |  | 18,615 |  | 2 |  | 18,613 |  |  |
Common stock warrants issued in connection with the 2009, 2010 and 2011 offerings |  |  | (12,709) |  |  |  | (12,709) |  |  |
Issuance of stock in lieu of cash bonus, shares |  |  |  |  | 147,040 |  |  |  |  |
Issuance of stock in lieu of cash bonus |  |  | 171 |  |  |  | 171 |  |  |
Issuance of restricted stock units, shares |  |  |  |  | 220,729 |  |  |  |  |
Issuance of restricted stock units |  |  | 256 |  |  |  | 256 |  |  |
Issuance of common stock for services, shares |  |  |  |  | 53,558 |  |  |  |  |
Issuance of common stock for services |  |  | 73 |  |  |  | 73 |  |  |
Issuance of common stock upon exercise of warrant, shares |  |  |  |  | 150,000 |  |  |  |  |
Issuance of common stock upon exercise of warrants |  |  | 150 |  |  |  | 150 |  |  |
Issuance of common stock in cashless exchange of outstanding warrants, shares |  |  |  |  | 4,151,000 |  |  |  |  |
Issuance of common stock in cashless exchange of outstanding warrants |  |  | 3,120 |  |  |  | 3,120 |  |  |
Issuance of common stock related to acquisition of Apthera Inc., shares |  |  |  |  | 4,974,090 |  |  |  |  |
Issuance of common stock related to acquisition of Apthera Inc. |  |  | 6,367 |  | 1 |  | 6,366 |  |  |
Issuance of common stock subject to employee termination agreements, shares |  |  |  |  | 398,453 |  |  |  |  |
Issuance of common stock subject to employee termination agreements |  |  | 350 |  |  |  | 350 |  |  |
Issuance of common stock subject to Employee Stock Purchase Plan, shares |  |  |  |  | 18,824 |  |  |  |  |
Issuance of common stock subject to Employee Stock Purchase Plan |  |  | 15 |  |  |  | 15 |  |  |
Stock based compensation expense for directors and employees |  |  | 2,774 |  |  |  | 2,774 |  |  |
Stock based compensation expense for services |  |  | (123) |  |  |  | (123) |  |  |
Value of common stock warrants issued (expense) in exchange for services |  |  | 108 |  |  |  | 108 |  |  |
Net loss | (11,485) |  | (11,485) |  |  |  |  | (11,485) |  |
Ending balance at Dec. 31, 2011 | $ 10,112 |  | $ 10,112 |  | $ 5 |  | $ 81,184 | $ (67,228) | $ (3,849) |
Ending balance, shares at Dec. 31, 2011 |  |  |  |  | 47,811,453 |  |  |  |  |

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