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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Year ended December 31,
| 2012 |  | 2011 |  | 2010
Supplemental non-cash investing and financing activities: |  |  |  |  |
Fair value of warrant liability reclassified to additional paid-in capital | $ | 13,973 |  |  | $ | — |  |  | $ | — |
Value exchanged in conversion of preferred stock to common stock | — |  |  | 11,205 |  |  | 4,795 |
Value of common stock issued in payment of convertible notes | — |  |  | 5,165 |  |  | — |
Value of common stock issued in payment of preferred stock dividends | — |  |  | 3,254 |  |  | — |
Value of common stock issued in payment of term loan debt | — |  |  | 1,398 |  |  | — |
Equipment acquired through capital leases | 1,263 |  |  | 1,334 |  |  | 615 |
Value of common stock issued in payment of debt issuance costs | — |  |  | — |  |  | 5,096 |
Reduction in convertible debt upon note exchange | — |  |  | — |  |  | 1,996 |
Value of common stock issued in exchange for convertible notes | — |  |  | — |  |  | 1,992 |
Debt related commitment fees included in accrued liabilities | — |  |  | — |  |  | 1,000 |
Exercise of stock options by common stock surrender | — |  |  | — |  |  | 111 |
Supplemental cash payment information: |  |  |  |  |
Interest paid | $ | 5,521 |  |  | $ | 7,627 |  |  | $ | 10,901 |
Income taxes paid (refunded) | 14,049 |  |  | (904 | ) |  | (6,186 | )

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