CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Deficit Accumulated During the Development Stage |
In Thousands, except Share data |
Beginning Balance at Dec. 31, 2011 | $4,666 | $12 | $197,769 | ($1,380) | ($191,735) |
Beginning Balance (in shares) at Dec. 31, 2011 | ' | 12,470,694 | ' | 112,350 | ' |
Stock based option compensation | 1,902 | 0 | 1,902 | 0 | 0 |
Issuance of 100 shares of common stock at a share price of $5.07 (in shares) | ' | 100 | ' | 0 | ' |
Issuance of shares of common stock, net of offering costs (in shares) | ' | 2,463,537 | ' | 0 | ' |
Exercise of stock options to purchase common stock for cash | 121 | 0 | 121 | 0 | 0 |
Exercise of stock options to purchase common stock for cash (in shares) | ' | 16,488 | ' | 0 | ' |
Issuance of shares of common stock for the cashless exercise of stock options (in shares) | ' | 11,173 | ' | 0 | ' |
Exercise of Series B Warrants to purchase common stock for cash @ $2.49 per share | 301 | 0 | 301 | 0 | 0 |
Exercise of Series B Warrants to purchase common stock for cash @ $2.49 per share (in shares) | ' | 121,079 | ' | 0 | ' |
Issuance of shares of common stock, net of offering costs 1 | 23,018 | 2 | 23,016 | 0 | 0 |
Issuance of shares of common stock, net of offering costs 1 (in shares) | ' | 2,145,636 | ' | 0 | ' |
Issuance of shares of common stock, net of offering costs | 10,310 | 3 | 10,307 | 0 | 0 |
Net loss | -10,123 | 0 | 0 | 0 | -10,123 |
Ending Balance at Sep. 30, 2012 | 30,195 | 17 | 233,416 | -1,380 | -201,858 |
Ending Balance (in shares) at Sep. 30, 2012 | ' | 17,228,707 | ' | 112,350 | ' |
Beginning Balance at Dec. 31, 2012 | 23,034 | 17 | 234,299 | -1,380 | -209,902 |
Beginning Balance (in shares) at Dec. 31, 2012 | ' | 17,272,505 | ' | 112,350 | ' |
Stock based option compensation | 2,258 | 0 | 2,258 | 0 | 0 |
Issuance of shares of common stock, net of offering costs (in shares) | ' | 4,312,500 | ' | 0 | ' |
Issuance of 871,634 shares of common stock for the cashless exercise of 872,133 Series A Warrants | 0 | 1 | -1 | 0 | 0 |
Issuance of 871,634 shares of common stock for the cashless exercise of 872,133 Series A Warrants (in shares) | ' | 871,634 | ' | 0 | ' |
Issuance of 614,564 shares of common stock for the cashless exercise of 716,463 Series B Warrants | 0 | 1 | -1 | 0 | 0 |
Issuance of 614,564 shares of common stock for the cashless exercise of 716,463 Series B Warrants (in shares) | ' | 614,564 | ' | 0 | ' |
Exercise of stock options to purchase common stock for cash | 47 | 0 | 47 | 0 | 0 |
Exercise of stock options to purchase common stock for cash (in shares) | ' | 2,500 | ' | 0 | ' |
Issuance of shares of common stock for the cashless exercise of stock options (in shares) | ' | 5,407 | ' | 0 | ' |
Exercise of Series B Warrants to purchase common stock for cash @ $2.49 per share | 107 | 0 | 107 | 0 | 0 |
Exercise of Series B Warrants to purchase common stock for cash @ $2.49 per share (in shares) | ' | 42,849 | ' | 0 | ' |
Issuance of shares of common stock, net of offering costs | 76,764 | 4 | 76,760 | 0 | 0 |
Net loss | -20,579 | 0 | 0 | 0 | -20,579 |
Ending Balance at Sep. 30, 2013 | $81,631 | $23 | $313,469 | ($1,380) | ($230,481) |
Ending Balance (in shares) at Sep. 30, 2013 | ' | 23,121,959 | ' | 112,350 | ' |