Loss per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Numerator:
Loss applicable to common stockholders	(29,983)	(41,707)	(55,633)	(72,681)
Denominator:
Denominator for basic and diluted loss per common share (in shares)	19,022,000	17,838,000	19,006,000	17,831,000
Loss per common share:
Basic and diluted (in dollars per share)	(1.58)	(2.34)	(2.93)	(4.08)
Options
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect	1,180,289	461,803	767,726	447,250
Warrants
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect	3,735,000	3,735,000	3,735,000	3,735,000
Number of warrants outstanding to purchase shares of common stock	3,735,000		3,735,000		3,735,000
Restricted stock
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect	660,168	342,049	660,168	342,049
Convertible preferred stock
Anti-dilutive securities
Number of securities excluded from the calculation of diluted loss per share because of anti-dilutive effect	5,780,282	5,105,488	5,780,282	5,105,488