Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net loss including noncontrolling interest	$ (7,634)	$ (22,308)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,413	2,640
Increase (decrease) in allowance for doubtful accounts	(17)	22
Lease termination charges	3,337	0
Loss on disposal of Grid business	0	254
Goodwill impairment charges	0	3,388
Loss on disposal of and write down of property, equipment and other	53	5,101
Reduction of (increase in) accrued investment income	(23)	18
Stock-based compensation	109	992
Adjustment to contingent consideration	(98)	0
Change in operating assets and liabilities:
Accounts receivable	(19)	2,953
Inventories	630	1,217
Deferred cost of goods sold	190	242
Other current assets	(418)	312
Accounts payable	(1,509)	(543)
Accrued liabilities	(55)	(865)
Deferred revenues	6	(751)
Deferred rent	(154)	(29)
Net cash used in operating activities	(4,189)	(7,357)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available‑for‑sale short‑term investments	(7,984)	(58,148)
Proceeds from maturities and sales of available‑for‑sale short‑term investments	20,852	80,116
Cash paid for acquisition, net of cash acquired	0	(1,155)
Proceeds from divestiture of Grid business	0	4,861
Change in other long‑term assets	(793)	232
Capital expenditures	(83)	(672)
Net cash provided by investing activities	11,992	25,234
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(11,147)	(1,676)
Restricted cash used as collateral for line of credit	0	(6,250)
Proceeds from exercise of stock options	0	17
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(152)	(411)
Net cash used in financing activities	(11,299)	(8,320)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(639)	(723)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(4,135)	8,834
CASH AND CASH EQUIVALENTS:
Beginning of period	13,340	14,648
End of period	9,205	23,482
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest on lease financing obligations	386	830
Cash paid for income taxes	187	265
NON CASH INVESTING ACTIVITIES:
Fair value of stock issued in connection with acquisition	$ 0	$ 715