Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Consolidated net loss	$ (10,358)	$ (9,586)
Adjustments to reconcile consolidated net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	4,854	5,028
Stock-based compensation expense	771	1,402
Provision for doubtful accounts	11	190
Decrease in long-term deferred revenue	(69)	(71)
Deferred income taxes		(4,307)
Severance charges		1,361
Excess tax benefit of stock-based compensation		(53)
Gain on disposal of equipment	(6)	(3)
Credit (gain) loss on available-for-sale securities	(20)	79
Increase in long-term income taxes payable	7	21
Change in current assets and liabilities, net	2,589	1,723
Net cash used for operating activities	(2,221)	(4,216)
Investing activities:
Additions to property, plant and equipment	(3,481)	(2,543)
Sales and maturities of investments	90	334
Proceeds from sale of equipment	6	3
(Increase) decrease in other assets	(32)	57
Net cash used for investing activities	(3,417)	(2,149)
Financing activities:
Proceeds from issuance of Common Stock	20	55
Purchases of Common Stock		(17,100)
Excess tax benefit of stock-based compensation		53
Net cash provided by (used for) financing activities	20	(16,992)
Effect of foreign exchange rates on cash	84	(419)
Net decrease in cash and cash equivalents	(5,534)	(23,776)
Cash and cash equivalents at beginning of period	56,339	84,554
Cash and cash equivalents at end of period	$ 50,805	$ 60,778