CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 24,355	$ 26,696
Investments	28,971
Accounts receivable	7,025	4,444
Inventories	12,686	10,180
Prepaid expenses	1,071	638
Other current assets	394	2,038
Total current assets	74,502	43,996
Non-current assets:
Property and equipment, net	1,848	1,698
Goodwill	1,316	1,316
Intangible assets, net	1,395	1,546
Restricted cash	306	304
Other assets	72	59
Total assets	79,439	48,919
Current liabilities:
Accounts payable	4,076	7,186
Accrued liabilities	12,060	7,619
Deferred revenue	111	77
Debt - current	3,638	4,828
Warrant liability	22,706	5,903
Total current liabilities	42,591	25,613
Non-current liabilities:
Debt - non-current		2,896
Deferred income taxes	82	62
Other non-current liabilities	1,120	1,241
Total liabilities	43,793	29,812
Commitments and contingencies
Common stock	70	56
Additional paid-in capital	532,938	478,903
Accumulated other comprehensive loss	(33)
Accumulated deficit	(497,329)	(459,852)
Total stockholders' equity	35,646	19,107
Total liabilities and stockholders' equity	$ 79,439	$ 48,919