Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Equipment note [Member]	Dec. 31, 2012 Equipment note [Member]	Dec. 31, 2013 Silicon Valley bank loan [Member]	Dec. 31, 2012 Silicon Valley bank loan [Member]	Dec. 31, 2013 Peoria facility note [Member]	Dec. 31, 2012 Peoria facility note [Member]	Dec. 31, 2013 HSBC Revolving Facility [Member]	Dec. 31, 2013 Convertible Senior Subordinated Notes [Member]	Jan. 31, 2013 Convertible Senior Subordinated Notes [Member]	Dec. 31, 2013 Secured and unsecured debt	Dec. 31, 2012 Secured and unsecured debt
Debt Instrument [Line Items]
Total debt	$ 92,218	$ 14,968	$ 70	$ 129		$ 11,233		$ 3,606	$ 10,369	$ 81,779		$ 10,439	$ 14,968
Fair value of embedded derivative	5,914
Unamortized debt discount	(4,610)										(5,300)
Current portion of debt	(65)	(7,331)
Long-term portion of debt	$ 93,457	$ 7,637
Maturity Date			January 2015	January 2015	March 2013	March 2013	February 2013	February 2013	March 2015	February 2018