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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net loss $ (32,451,000) $ (27,494,000) $ (23,216,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 855,000 931,000 1,681,000
Amortization of deferred financing costs and debt discount 711,000 703,000 709,000
Warranty provision (reversal) 0 0 (23,000)
Increase (reduction) in allowance for doubtful accounts 483,000 460,000 663,000
Change in fair value of warrants (4,360,000) (1,285,000) 4,574,000
Change in fair value of option liability 740,000 30,000 (920,000)
Stock-based compensation 3,316,000 3,055,000 2,649,000
Equity loss from investment in joint venture 209,000 151,000 44,000
Increases (decreases) in cash caused by changes in operating assets and liabilities:      
Accounts receivable (670,000) (902,000) (986,000)
Inventories 60,000 (777,000) (446,000)
Other current assets (3,000) 36,000 41,000
Other assets (1,206,000) (110,000) 75,000
Accounts payable and accrued expenses (1,436,000) 811,000 413,000
Deferred revenues, related party (1,992,000) (2,122,000) (8,840,000)
Deferred revenues 315,000 2,541,000 (57,000)
Long-term deferred rent 106,000 398,000 (168,000)
Net cash used in operating activities (35,323,000) (23,574,000) (23,807,000)
Cash flows from investing activities:      
Purchases of property and equipment (560,000) (610,000) (221,000)
Cash invested in restricted cash 0 (350,000) 0
Investment in joint venture 0 (330,000) 0
Net cash used in investing activities (560,000) (1,290,000) (221,000)
Cash flows from financing activities:      
Principal payments on long-term obligations (4,529,000) (5,454,000) (2,053,000)
Proceeds from long-term obligations 9,444,000 20,000,000 0
Debt issuance costs and loan fees (719,000) (559,000) 0
Proceeds from exercise of employee stock options and warrants 2,849,000 7,128,000 531,000
Proceeds from sale of common stock 13,286,000 45,486,000 23,196,000
Costs from sale of common stock (194,000) (1,923,000) (1,336,000)
Proceeds from sale of treasury stock 0 0 3,933,000
Net cash provided by financing activities 20,137,000 64,678,000 24,271,000
Net (decrease) increase in cash and cash equivalents (15,746,000) 39,814,000 243,000
Cash and cash equivalents at beginning of year 52,668,000 12,854,000 12,611,000
Cash and cash equivalents at end of year 36,922,000 52,668,000 12,854,000
Cash paid during period for:      
Interest 2,031,000 1,226,000 739,000
Final payment fee on long-term debt 419,000 205,000 0
Supplemental schedule of non-cash investing and financing activities:      
Fair value of warrants allocated to additional paid-in capital 267,000 279,000 0
Additions to fixed assets included in accounts payable and accrued expenses   481,000 0
Capital equipment lease $ 79,000 $ 0 $ 0