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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (18,328) $ (29,401)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 571 1,404
Restricted stock compensation expense 241 481
Depreciation expense 604 699
Warrant liability fair value adjustment (2,842) (579)
Loss on disposal equipment 5 0
Non-cash interest income 1 3
Changes in assets and liabilities:    
Increase in prepaid expenses and other current assets (132) (197)
Decrease (increase) in accounts receivable 84 (102)
Decrease (increase) in inventories 174 (516)
Increase (decrease) in accounts payable and accrued expenses (1,576) 1,014
Decrease in deferred revenue (300) 0
Net cash used in operating activities (21,498) (27,194)
Cash flows from investing activities:    
Purchase of property, plant, and equipment (79) (1,252)
Purchase of short-term investments and marketable equity securities 0 0
Proceeds from maturities of short-term investments 0 4,980
Net cash (used in) provided by investing activities (79) 3,728
Cash flows from financing activities:    
Net proceeds from sale of stock and exercise of stock options and warrants 29,975 26,975
Net cash provided by financing activities 29,975 26,975
Foreign currency effects on cash 202 0
(Decrease) increase in cash and cash equivalents 8,600 3,509
Cash and cash equivalents at beginning of period 23,726 25,777
Cash and cash equivalents at end of period 32,326 29,286
Supplemental non-cash activities:    
Fair value of warrants issued 0 4,055
Fair value of warrants exercised $ 219 $ 0