Supplemental Cash Flow Information (Tables)

12 Months Ended

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		)