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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 Convertible Notes Due 2016	Dec. 31, 2012 Convertible Notes Due 2016	Oct. 31, 2011 Convertible Notes Due 2016
Fair Value of Financial Instruments
Convertible Senior Notes, stated percentage			1.00%	1.00%	1.00%
Inventories:
Raw materials	$ 13,603,000	$ 18,377,000
Work-in-progress	11,708,000	11,802,000
Finished goods	11,943,000	17,579,000
Total inventories	37,254,000	47,758,000
Increase in reserves for obsolescence	$ 8,900,000