CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net loss	$ (17,764,000)	$ (23,282,000)
Loss from discontinued operation	0	(2,321,000)
Loss from continuing operations	(17,764,000)	(20,961,000)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	167,000	430,000
Charge for 401(k) company common stock match	291,000	332,000
Stock-based compensation	1,483,000	1,912,000
Inventory impairment	202,000	886,000
Gain on sale of property and equipment	(33,000)	0
Changes in operating assets and liabilities:
Accounts receivables	(231,000)	769,000
Due from related party	(35,000)	(49,000)
Unbilled receivables	132,000	34,000
Inventory	9,000	191,000
Prepaid expenses and other assets	(687,000)	254,000
Accounts payable	48,000	(211,000)
Accrued expenses	18,000	(1,355,000)
Deferred rent and other long-term liabilities	0	(50,000)
Deferred revenue	7,000	(364,000)
Net cash used by continuing operations for operating activities	(16,393,000)	(18,182,000)
Net cash used by discontinued operations for operating activities	0	(460,000)
Net cash used in operating activities	(16,393,000)	(18,642,000)
Cash flows from investing activities
Purchase of property and equipment	(498,000)	(153,000)
Proceeds from sale of equipment	40,000	0
Purchase of short-term investments	0	(1,508,000)
Proceeds from the sale and maturity of short-term investments	0	13,019,000
Net cash (used by) provided by investing activities	(458,000)	11,358,000
Cash flows from financing activities
Proceeds from options exercised	0	300,000
Proceeds from private placement offerings, net of issuance costs	14,703,000	24,913,000
Net cash provided by financing activities	14,703,000	25,213,000
Effect of exchange rate changes on cash and cash equivalents	(4,000)	(141,000)
Net (decrease) increase in cash and cash equivalents	(2,152,000)	17,788,000
Cash and cash equivalents at beginning of period	20,046,000	7,698,000
Cash and cash equivalents at end of period	17,894,000	25,486,000
Supplemental disclosure of non-cash information:
Purchase of property and equipment included in accounts payable and accrued expenses	128,000	0
Offering costs included in accrued expenses	75,000	0
Restricted stock units issued to settle incentive compensation obligation	$ 305,000	$ 0