Quarterly Results of Operations (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Results of Operations (unaudited)
Revenue	$ 44,624,000	$ 44,640,000	$ 59,114,000	$ 55,007,000	$ 60,411,000	$ 72,455,000	$ 93,380,000	$ 93,170,000	$ 203,385,000	$ 319,416,000	$ 275,212,000
Gross profit	480,000	14,367,000	22,788,000	20,536,000	22,623,000	26,895,000	34,138,000	31,081,000	58,171,000	114,737,000	85,838,000
Net income (loss)	(14,818,000)	(8,718,000)	(471,000)	(10,027,000)	(2,113,000)	1,151,000	4,227,000	1,812,000	(34,034,000)	5,077,000	(17,573,000)
Net income (loss) per share basic and diluted (in dollars per share)	$ (0.14)	$ (0.08)		$ (0.09)	$ (0.02)	$ 0.01	$ 0.04	$ 0.02		$ 0.05	$ (0.17)
Tax expense related to an uncertain tax position in a certain foreign jurisdiction			800,000		900,000
Quarterly charges and expenses
Gain on sale of dry strip assets and intellectual property									7,904,000
Restructuring charges	600,000	600,000	100,000	2,900,000					4,169,000
One-time expense
Quarterly charges and expenses
One-time marketing expense	2,100,000
Dry strip product line, intellectual property rights and certain assets
Quarterly charges and expenses
Gain on sale of dry strip assets and intellectual property									7,900,000
Inventory reserves
Quarterly charges and expenses
Provision for excess inventory	13,400,000								14,492,000	1,015,000	2,015,000
Gain on sale of dry strip assets and intellectual property	$ 7,904,000								$ 7,904,000