Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Cash Flows [Abstract]
Net loss	$ (8,018)	$ (3,654)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation	158	239
Amortization of intangible assets	33	40
Gain on disposal of property and equipment	0	(2)
Non-cash share-based compensation expense	305	385
Realized loss on warrant exchange	4,967	0
Non-cash deferred rent	(15)	0
Change in:
Accounts receivable, net	(111)	(391)
Inventory	0	280
Other current assets	85	509
Other assets	0	4
Accounts payable	(274)	(754)
Accrued liabilities	272	(506)
Deferred revenue	0	(246)
Billings in excess of costs and estimated earnings on uncompleted contracts	(333)	594
Net cash used in operating activities	(2,931)	(3,502)
Cash flows from investing activities
Decrease in restricted cash	0	1
Proceeds on sale of property and equipment	0	2
Purchases of property and equipment	(77)	(4)
Net cash used in investing activities	(77)	(1)
Cash flows from financing activities
Principal payments under capital leases and long-term debt	(10)	(37)
Net proceeds from issuance of common stock and warrants	12,981	0
Net cash provided by (used in) financing activities	12,971	(37)
Net increase (decrease) in cash and cash equivalents	9,963	(3,540)
Cash and cash equivalents, at beginning of period	5,375	6,850
Cash and cash equivalents, at end of period	15,338	3,310
Supplemental disclosure of cash flow information
Cash paid for interest	0	5
Supplemental schedule of non-cash investing and financing activities
Other non-cash additions to property and equipment	0	33
Issuance of common stock for exchange of warrants	$ 9,869	$ 0