CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 22,343	$ 29,485	[1]
Short-term investments	25,231	28,191	[1]
Accounts receivable	7,366	6,125	[1]
Inventories	13,503	13,063	[1]
Prepaid expenses	1,780	848	[1]
Other current assets	2,429	442	[1]
Total current assets	72,652	78,154	[1]
Non-current assets:
Property and equipment, net	3,882	2,189	[1]
Goodwill	1,316	1,316	[1]
Intangible assets, net	1,193	1,344	[1]
Restricted cash	301	308	[1]
Other assets	51	70	[1]
Total assets	79,395	83,381	[1]
Current liabilities:
Accounts payable	4,115	5,674	[1]
Accrued liabilities	12,547	9,813	[1]
Deferred revenue	560	181	[1]
Debt - current	0	3,366	[1]
Warrant liability	3,931	20,390	[1]
Total current liabilities	21,153	39,424	[1]
Non-current liabilities:
Debt - non-current	9,860	0	[1]
Deferred income taxes	108	89	[1]
Other non-current liabilities	998	1,073	[1]
Total liabilities	32,119	40,586	[1]
Commitments and contingencies			[1]
Stockholders' equity:
Common stock	77	72	[1]
Additional paid-in capital	568,972	545,905	[1]
Accumulated other comprehensive (loss) income	(11)	7	[1]
Accumulated deficit	(521,762)	(503,189)	[1]
Total stockholders' equity	47,276	42,795	[1]
Total liabilities and stockholders' equity	$ 79,395	$ 83,381	[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.