Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income (loss)	$ (17,144)	$ (34,034)	$ 5,077
Adjustments to reconcile net income (loss) to net cash (used for) provided by operating activities:
Depreciation and amortization	5,075	6,877	8,497
Gain on sale of dry strip assets and intellectual property	(1,167)	(7,904)
Deferred taxes	(1,465)	826	585
Other		186	28
Stock-based compensation expense	4,337	3,976	4,687
Provision for excess inventory	2,562	14,492	1,015
Changes in operating assets & liabilities
Accounts receivable	(11,528)	10,478	22,692
Inventories	2,209	5,903	(11,870)
Prepaid expenses and other current assets	125	4,386	3,049
Accounts payable and other current liabilities	7,308	(13,490)	(17,940)
Deferred revenue	(2,181)	(5,396)	(4,006)
Income taxes	133	(225)	507
Other assets and liabilities	(3,306)	3,328	(8,788)
Net cash (used for) provided by operating activities	(15,042)	(10,597)	3,533
Cash flows from investing activities
Proceeds from sale of dry strip assets and intellectual property	1,200	8,716
Expenditures for property, plant, and equipment	(821)	(591)	(2,124)
Decrease (increase) in restricted cash	106	(2)	3
Net cash provided by (used for) investing activities	485	8,123	(2,121)
Cash flows from financing activities
Increase in restricted cash	(825)
Financing fees and other expenses	(560)		(200)
Proceeds from exercise of stock options	1,669	968	288
Proceeds from Employee Stock Purchase Plan	436	331	503
Proceeds from issuance of Term Loan	15,000
Net cash provided by financing activities	15,720	1,299	591
Effect of exchange rate changes on cash	141	(716)	(869)
Net increase (decrease) in cash and cash equivalents	1,304	(1,891)	1,134
Cash and cash equivalents at beginning of period	44,986	46,877	45,743
Cash and cash equivalents at end of period	46,290	44,986	46,877
Cash paid for:
Income taxes	737	848	515
Interest paid	$ 409