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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (41,210) $ (15,616)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 2,159 2,921
Restricted stock compensation expense 763 438
Depreciation expense 1,044 723
Warrant liability fair value adjustment (1,025) (14,864)
Non-cash interest income (3) (1)
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other current assets (206) 742
Decrease (increase) in inventories (941) 0
Decrease (increase) in accounts receivables (43) 0
Deferred revenue 58 0
Increase (decrease) in accounts payable and accrued expenses (1,250) 1,843
Net cash used in operating activities (40,654) (23,814)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2,076) (2,275)
Proceeds from maturities of short-term investments 4,980 (2,243)
Net cash provided by (used in) investing activities 2,904 (4,518)
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of stock options and warrants 40,188 23,674
Net cash provided by financing activities 40,188 23,674
Effect of exchange rate on cash 83 0
(Decrease) increase in cash and cash equivalents 2,521 (4,658)
Cash and cash equivalents at beginning of period 25,777 45,621
Cash and cash equivalents at end of period 28,298 40,963
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 and exercised $ 3,147 $ 0