Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net loss	$ (17,758)	$ (19,216)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	3,948	5,419
Gain on sale of dry strip assets and intellectual property	(1,167)
Deferred taxes	272	998
Stock-based compensation expense	3,105	3,411
Provision for excess inventory	2,451	678
Changes in operating assets & liabilities
Accounts receivable	(4,359)	10,143
Inventories	3,455	(3,496)
Prepaid expenses and other current assets	(429)	4,490
Accounts payable and other current liabilities	6,276	(11,601)
Deferred revenue	(2,816)	(5,089)
Income taxes	(14)	(135)
Other assets and liabilities	(3,813)	3,025
Net cash used for operating activities	(10,849)	(11,373)
Cash flows from investing activities
Proceeds from sale of dry strip assets and intellectual property	1,200
Expenditures for property, plant, and equipment	(484)	(536)
(Increase) decrease in restricted cash	(1,477)	1
Net cash used for investing activities	(761)	(535)
Cash flows from financing activities
Increase in restricted cash	(825)
Financing fees and other expenses	(473)
Proceeds from exercise of stock options	1,113	863
Proceeds from Employee Stock Purchase Plan	197	179
Proceeds from issuance of Term Loan	15,000
Net cash provided by financing activities	15,012	1,042
Effect of exchange rate changes on cash	(71)	(791)
Net increase (decrease) in cash and cash equivalents	3,331	(11,657)
Cash and cash equivalents at beginning of period	44,986	46,877
Cash and cash equivalents at end of period	$ 48,317	$ 35,220