Consolidated Balance Sheet Details - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]
Accrued product returns	$ 1,985	$ 4,694
Accrued interest expense, current portion	178	32
Accrued clinical trial costs	1,162	554
Other accrued expenses	1,292	736
Accrued expenses	$ 4,617	$ 6,016