Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net loss	$ (13,008)	$ (10,499)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	2,719	3,625
Gain on sale of dry strip assets and intellectual property	(1,167)
Deferred taxes	52	995
Stock-based compensation expense	1,644	2,010
Provision for excess inventory	2,370	406
Changes in operating assets & liabilities
Accounts receivable	(5,587)	16
Inventories	431	(7,213)
Prepaid expenses and other current assets	(1,049)	(808)
Accounts payable and other current liabilities	5,642	(3,928)
Deferred revenue	(891)	(3,109)
Income taxes	(48)	(286)
Other assets and liabilities	(1,905)	6,226
Net cash used for operating activities	(10,797)	(12,565)
Cash flows from investing activities
Proceeds from sale of dry strip assets and intellectual property	1,200
Expenditures for property, plant, and equipment	(336)	(385)
Decrease in restricted cash	2	3
Net cash provided by (used for) investing activities	866	(382)
Cash flows from financing activities
Proceeds from exercise of stock options	206	847
Proceeds from Employee Stock Purchase Plan	197	179
Net cash provided by financing activities	403	1,026
Effect of exchange rate changes on cash	(819)	(1,159)
Net decrease in cash and cash equivalents	(10,347)	(13,080)
Cash and cash equivalents at beginning of period	44,986	46,877
Cash and cash equivalents at end of period	$ 34,639	$ 33,797