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STOCKHOLDERS' EQUITY (Details) (USD $) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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May 30, 2011 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 30, 2010 | Feb. 28, 2013 Subsequent event | Jan. 31, 2013 Subsequent event | Dec. 31, 2012 Class C Preferred Stock | Dec. 31, 2012 Series C-1 Preferred Stock | Dec. 31, 2012 Cantor Agreement | Dec. 31, 2011 Cantor Agreement | Jan. 31, 2011 Cantor Agreement | Sep. 30, 2012 Cantor Amendment | Dec. 31, 2012 Cantor Amendment | Feb. 28, 2013 Cantor Amendment Subsequent event | Jan. 31, 2013 Cantor Amendment Subsequent event | Dec. 31, 2012 Shareholder Rights Plan item | Dec. 31, 2012 Shareholder Rights Plan Minimum | Dec. 31, 2012 Shareholder Rights Plan Series C-1 Preferred Stock item | Dec. 31, 2012 Shareholder Rights Plan Series C-1 Preferred Stock Minimum
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum value of securities for which the entity filed a shelf registration statement |  |  | $ 200,000,000 |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  | 64,359,513 | 44,210,636 |  |  |  |  |  |  | 4,425,000 | 575,000 |  |  | 3,578,290 |  | 2,433,608 |  |  |  |
Common stock available for sale (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Net proceeds from sale of common stock |  |  | 83,784,000 | 36,023,000 | 1,014,000 |  | 97,000,000 | 17,100,000 |  |  | 19,000,000 | 2,200,000 |  |  | 21,100,000 |  | 17,100,000 |  |  |  |
Aggregate offering price of additional shares which the entity can issue as per amended agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,000,000 |  | 4,400,000 |  |  |  |  |
Fixed commission rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.030 |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |
Lock-up period to be waived by underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |
Common stock in an underwritten public offering issued (in shares) | 11,500,000 | 12,075,000 |  |  |  |  | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of over-allotment option by underwriters (in shares) | 1,500,000 | 1,575,000 |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of stock in an underwritten public offering | $ 33,700,000 | $ 43,400,000 | $ 43,483,000 | $ 33,695,000 |  |  | $ 97,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 3,000,000 | 3,000,000 |  |  |  |  | 3,000,000 | 350,000 |  |  |  |  |  |  |  |  |  |  |
Shareholder Rights Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred stock purchase rights for each outstanding share of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Number of shares callable by rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0001 |
Exercise price (in dollars per unit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00 |
Percentage of common stock to be acquired for rights to be exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Percentage of common stock to be acquired in a tender offer for rights to be exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Number of multiples of the exercise price that the Right holder has right to receive in value if 15% or more of the outstanding common stock is acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Percentage of assets or earning power sold allowing the Right holder a right to receive common stock of the acquiring company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Number of multiples of the exercise price that the Right holder has a right to receive in value of the acquiring company's common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |

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