Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 74,568	$ 36,313	[1]
Restricted cash	213	163	[1]
Short-term investments	0	22,096	[1]
Accounts receivable, net	26	0	[1]
Inventories	225	0	[1]
Prepaid expenses and other	8,056	1,610	[1]
Total current assets	83,088	60,182	[1]
Intangible assets, net	2,820	2,156	[1]
Goodwill	3,275	3,275	[1]
Fixed assets, net	939	416	[1]
Deposits	141	26	[1]
Deferred offering costs	20	109	[1]
Debt issuance costs	3,065	1,959	[1]
Total assets	93,348	68,123	[1]
Current liabilities:
Accounts payable	2,315	4,599	[1]
Accrued liabilities	6,094	2,150	[1]
Common stock warrant liability	13,468	16,405	[1]
Deferred rent	0	6	[1]
Capital lease liability - current	18	8	[1]
Total current liabilities	21,895	23,168	[1]
Note payable	50,000	25,000	[1]
Capital lease liability - long-term	51	11	[1]
Total liabilities	71,946	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 58,314,471 and 52,424,649 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	58	52	[1]
Additional paid-in capital	197,534	155,945	[1]
Accumulated other comprehensive loss	(204)	(115)	[1]
Accumulated deficit	(175,986)	(135,938)	[1]
Total stockholders' equity	21,402	19,944	[1]
Total liabilities and stockholders' equity	$ 93,348	$ 68,123	[1]

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