Inventory
 9 Months Ended
Sep. 30, 2012
Inventory Disclosure [Abstract]  
Inventory
Inventory
     Inventories as of September 30, 2012 and December 31, 2011, which were included in prepaid expenses and other current assets in the Company's condensed balance sheets, consist of the following:
 
September 30,
2012
 
December 31,
2011
Raw materials
$
6,553

 
$
4,666

Work in process
18,580

 
10,806

Finished goods
4,437

 
1,142

 
$
29,570

 
$
16,614


     For the three and nine months ended September 30, 2012, cost of goods sold included inventory write-downs and reserves totaling $0.2 million and $8.6 million, respectively. For the three and nine months ended September 30, 2011, there were no inventory write-downs or reserves included in cost of goods sold.