Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (6,726)	$ (13,008)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	2,299	2,719
Gain on sale of dry strip assets and intellectual property		(1,167)
Deferred taxes	334	52
Stock-based compensation expense	2,182	1,644
Provision for excess and obsolete inventory	244	2,370
Changes in operating assets & liabilities:
Accounts receivable	4,493	(5,587)
Inventories	(10,917)	431
Prepaid expenses and other current assets	(1,334)	(1,049)
Accounts payable and other current liabilities	(3,860)	5,642
Deferred revenue	(377)	(891)
Income taxes	13	(48)
Other assets and liabilities	1,794	(1,905)
Net cash used for operating activities	(11,855)	(10,797)
Cash flows from investing activities
Proceeds from sale of dry strip assets and intellectual property		1,200
Purchases of property, plant, and equipment	(567)	(336)
Decrease in restricted cash		2
Net cash (used for) provided by investing activities	(567)	866
Cash flows from financing activities
Proceeds from exercise of stock options	1,583	206
Proceeds from Employee Stock Purchase Plan	227	197
Net cash provided by financing activities	1,810	403
Effect of exchange rate changes on cash and cash equivalents	(90)	(819)
Net decrease in cash and cash equivalents	(10,702)	(10,347)
Cash and cash equivalents at beginning of period	46,290	44,986
Cash and cash equivalents at end of period	$ 35,588	$ 34,639