Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012		Aug. 31, 2012
Current assets:
Cash and cash equivalents	$ 88,334	$ 36,313	[1]	$ 23,580
Restricted cash	500	163	[1]
Short-term investments	0	22,096
Accounts receivable, net	5,519	0	[1]
Inventories, net	2,218	0	[1]
Prepaid expenses and other	2,764	1,610	[1]
Total current assets	99,335	60,182	[1]
Intangible assets, net	3,272	2,156	[1]
Goodwill	3,275	3,275	[1]
Fixed assets, net	1,309	416	[1]
Deposits	153	26	[1]
Deferred offering costs	172	109	[1]
Debt issuance costs	2,929	1,959	[1]
Total assets	110,445	68,123	[1]
Current liabilities:
Accounts payable	1,847	4,599	[1]
Accrued liabilities	9,260	2,150
Deferred revenue	3,010	0	[1]
Common stock warrant liability	10,339	16,405	[1]
Deferred rent	157	6	[1]
Capital lease liability - current	18	8	[1]
Total current liabilities	24,631	23,168	[1]
Note payable	50,000	25,000	[1]
Capital lease liability - long-term	45	11	[1]
Total liabilities	74,676	48,179	[1]
Commitments and contingencies - see Note 8					[1]
Stockholders' equity:
Preferred stock, $0.001 par value per share,15,000,000 shares authorized, zero shares issued and outstanding	0	0	[1]
Common stock, $0.001 par value per share, 150,000,000 shares authorized 61,142,756 and 52,424,649 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	61	52	[1]
Additional paid-in capital	229,164	155,945	[1]
Accumulated other comprehensive loss	(193)	(115)	[1]
Accumulated deficit	(193,263)	(135,938)	[1]
Total stockholders' equity	35,769	19,944	[1]
Total liabilities and stockholders' equity	$ 110,445	$ 68,123	[1]

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2012.