Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Accrued Liabilities [Line Items]
Accrued compensation and related costs	$ 2,956	$ 2,527
Accrued inventory costs	4,610	3,553
Accrued professional services	2,928	2,722
Other accrued expenses	2,053	1,011
Total accrued liabilities	$ 12,547	$ 9,813	[1]

[1] The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.