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Statement of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net loss $ (17,209,000) $ (7,827,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 400,000 553,000
Amortization of deferred financing costs and debt discount 471,000 199,000
Provision for doubtful accounts 235,000 567,000
Change in fair value of warrants (2,178,000) (3,628,000)
Change in fair value of option liabilities 110,000 200,000
Share-based compensation expense 1,721,000 1,468,000
Equity loss from investment in joint venture 102,000 55,000
Increases (decreases) in cash caused by changes in operating assets and liabilities:    
Accounts receivable (623,000) (1,509,000)
Inventories (513,000) 34,000
Other current assets (15,000) 289,000
Other assets (905,000) 0
Accounts payable and accrued expenses 92,000 (227,000)
Deferred revenues, related party (1,231,000) (2,122,000)
Deferred revenues 35,000 47,000
Long-term deferred rent (24,000) 0
Net cash used in operating activities (19,532,000) (11,901,000)
Cash flows from investing activities:    
Purchases of property and equipment (433,000) (348,000)
Investment in joint venture 0 (330,000)
Net cash used in investing activities (433,000) (678,000)
Cash flows from financing activities:    
Principal payments on long-term obligations (2,230,000) (5,454,000)
Proceeds from long term obligations 0 20,000,000
Debt issuance costs and loan fees 0 (559,000)
Proceeds from exercise of employee stock options and warrants 2,756,000 7,042,000
Proceeds from sale of common stock and warrants 0 17,314,000
Costs from sale of common stock and warrants 0 (518,000)
Net cash provided by financing activities 526,000 37,825,000
Net increase (decrease) in cash and cash equivalents (19,439,000) 25,246,000
Cash and cash equivalents at beginning of period 52,668,000 12,854,000
Cash and cash equivalents at end of period 33,229,000 38,100,000
Supplemental disclosure of cash flows information:    
Interest 989,000 287,000
Final payment fee on long-term debt 0 205,000
Supplemental schedule of non-cash investing and financing activities:    
Fair value of warrants allocated to additional paid in capital 0 279,000
Capital equipment lease $ 94,000