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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Statement of Cash Flows [Abstract]    
Net loss $ (14,774) $ (10,757)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation 331 727
Amortization of intangible assets 99 118
Gain on disposal of property and equipment (29) (35)
Non-cash share-based compensation expense 717 996
Change in warrant liability    (397)
Realized loss on warrant exchange 4,967 (18)
Inventory write-downs 42 303
Non-cash deferred rent (47) (16)
Change in:    
Accounts receivable, net (553) 978
Inventory (72) 166
Other current assets (118) 789
Other assets 0 4
Accounts payable 110 (1,413)
Accrued liabilities (5) (896)
Deferred revenue 0 (609)
Billings in excess of costs and estimated earnings on uncompleted contracts (577) 111
Net cash used in operating activities (9,909) (9,949)
Cash flows from investing activities    
Decrease in restricted cash 0 1
Proceeds on sale of property and equipment 34 35
Purchases of property and equipment (173) (273)
Net cash used in investing activities (139) (237)
Cash flows from financing activities    
Principal payments under capital leases and long-term debt (15) (106)
Net proceeds from issuance of common stock and warrants 15,584 11,763
Net cash provided by financing activities 15,569 11,657
Net increase (decrease) in cash and cash equivalents 5,521 1,471
Cash and cash equivalents, at beginning of period 5,375 6,850
Cash and cash equivalents, at end of period 10,896 8,321
Supplemental disclosure of cash flow information    
Cash paid for interest 2 10
Supplemental schedule of non-cash investing and financing activities    
Other non-cash additions to property and equipment 0 431
Issuance of common stock for exchange of warrants $ 9,869 $ 207