Income Taxes - Schedule of Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net operating losses	$ 80,388	$ 61,739
Capitalized research and development	8,172	8,903
Accrued expenses	3,263	3,707
Research and development credits	2,010	1,237
Accrued product returns	2,029	1,087
Inventory reserve and UNICAP	660	688
Depreciation and amortization	1,691	645
Other, net	4,736	2,341
Total deferred tax assets	102,949	80,347
Less valuation allowance	(102,949)	(80,347)
Net deferred tax assets	$ 0	$ 0