Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Consolidated net loss	$ (14,027)	$ (10,484)
Adjustments to reconcile consolidated net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	7,313	7,555
Stock-based compensation expense	1,173	1,893
Provision for doubtful accounts	30	230
Decrease in long-term deferred revenue	(104)	(104)
Deferred income taxes		(5,491)
Excess tax benefit of stock-based compensation		(53)
Gain on disposal of equipment	(6)	(3)
Credit (gain) loss on available-for-sale securities	(39)	78
(Decrease) increase in long-term income taxes payable	(538)	33
Change in current assets and liabilities, net	7,649	3,666
Net cash provided by (used for) operating activities	1,451	(2,680)
Investing activities:
Additions to property, plant and equipment	(4,859)	(4,027)
Sales and maturities of investments	190	603
Purchases of investments	(80)
Proceeds from sale of equipment	6	3
(Increase) decrease in other assets	(37)	49
Net cash used for investing activities	(4,780)	(3,372)
Financing activities:
Proceeds from issuance of Common Stock	143	58
Purchases of Common Stock		(17,100)
Excess tax benefit of stock-based compensation		53
Net cash provided by (used for) financing activities	143	(16,989)
Effect of foreign exchange rates on cash	33	(325)
Net decrease in cash and cash equivalents	(3,153)	(23,366)
Cash and cash equivalents at beginning of period	56,339	84,554
Cash and cash equivalents at end of period	$ 53,186	$ 61,188