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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (29,401) $ (7,307)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 1,404 2,208
Restricted stock compensation expense 481 253
Depreciation expense 699 456
Warrant liability fair value adjustment (579) (10,992)
Non-cash interest income 3 0
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other current assets (197) 300
Decrease (increase) in inventories (516) 0
Decrease (increase) in accounts receivables (102) 0
Increase (decrease) in accounts payable and accrued expenses 1,014 816
Net cash used in operating activities (27,194) (14,266)
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,252) (1,879)
Proceeds from maturities of short-term investments 4,980 1,492
Net cash provided by (used in) investing activities 3,728 (387)
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of stock options and warrants 26,975 83
Net cash provided by financing activities 26,975 83
(Decrease) increase in cash and cash equivalents 3,509 (14,570)
Cash and cash equivalents at beginning of period 25,777 45,621
Cash and cash equivalents at end of period 29,286 31,051
Supplemental cash flow information:    
Cash paid for interest 0 0
Supplemental non-cash activities:    
Cashless exercise of stock options and shares surrendered upon restricted stock vesting 0 61
Fair value of warrants issued $ 4,055 $ 0