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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Liabilities measured at fair value on a recurring basis, fair value hierarchy of valuation techniques
Liabilities required to be measured at fair value on a recurring basis, including identification of the fair value hierarchy of the valuation techniques used by the Company to determine these fair values, are as follows (in thousands):
 
Fair Value Measurements Using
 
Level 1
 
Level 2
 
Level 3
 
Total
At December 31, 2012:
 
 
 
 
 
 
 
None
$
—

 
$
—

 
$
—

 
$
—

At December 31, 2011:
 
 
 
 
 
 
 
Common stock warrants (1)
$
—

 
$
—

 
$
16,622

 
$
16,622
Changes in warrant liability
Changes in Level 3 liabilities are as follows (in thousands):
 
December 31,
 
2012
 
2011
Balance, beginning of year
$
16,622

 
$
26,193

Fair value adjustments, net
(2,649
)
 
(9,571
)
Reclassification to additional paid-in capital
(13,973
)
 
—

Net transfers in/(out)
—

 
—

Balance, end of year
$
—

 
$
16,622
Carrying value and estimated fair value of convertible notes and long-term debt
The carrying value and estimated fair value of the Company’s convertible notes and long-term debt are as follows (in thousands):
 
December 31,
 
2012
 
2011

Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
2008 Notes (1)
$
5,133

 
$
5,163

 
$
65,604

 
$
69,880

2010 Notes (1)
—

 
—

 
34,134

 
37,561

2012 Term Loan
25,000

 
25,000

 
—

 
—

Capital lease obligations
1,784

 
1,736

 
1,642

 
1,611

(1)
The carrying value of the 2008 and 2010 Notes represents the discounted debt component only, while the fair value of the Notes is based on the market value of the respective notes, including convertible equity features.