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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net loss $ (14,542) $ (18,120) $ (13,178)
Adjustments to reconcile net loss to net cash used in operations:      
Depreciation 429 414 923
Amortization of intangible assets 128 132 158
Impairment of intangible assets 0 40 277
Non-cash share-based compensation expense 1,007 713 1,606
(Gain) loss on warrant exchange 0 4,967 (1,900)
Inventory write-downs 287 42 303
Other non-cash adjustments (62) (91) (66)
Change in:      
Accounts receivable, net (1,018) (645) 1,091
Inventory (1,033) (109) 145
Other current and non-current assets (147) (155) 884
Accounts payable 493 (25) (1,486)
Accrued liabilities 590 335 (1,387)
Deferred revenue 8,271 0 (609)
Billings on uncompleted contracts in excess of related costs (230) (450) 582
Net cash used in operating activities (5,827) (12,952) (12,657)
Cash flows from investing activities      
Proceeds on sale of property and equipment 0 34 35
Purchases of property and equipment (1,140) (207) (375)
Net cash used in investing activities (1,140) (173) (340)
Cash flows from financing activities      
Principal payments under capital leases and long-term debt 0 (15) (120)
Net proceeds from issuance of common stock and warrants 6,506 16,114 11,642
Net cash provided by financing activities 6,506 16,099 11,522
Net increase (decrease) in cash and cash equivalents (461) 2,974 (1,475)
Cash and cash equivalents, at beginning of period 8,349 5,375 6,850
Cash and cash equivalents, at end of period 7,888 8,349 5,375
Supplemental disclosure of cash flow information      
Cash paid for interest 2 3 12
Supplemental schedule of non-cash investing and financing activities      
Non-cash additions to property and equipment 165 101 407
Issuance of common stock for exchange of warrants $ 0 $ 9,869 $ 536