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
Restricted cash	213	163
Short-term investments	0	22,096
Accounts receivable, net	26	0
Inventories	225	0
Prepaid expenses and other	8,056	1,610
Total current assets	83,088	60,182
Intangible assets, net	2,820	2,156
Goodwill	3,275	3,275
Fixed assets, net	939	416
Deposits	141	26
Other Assets	20	109
Debt issuance costs	3,065	1,959
Total assets	93,348	68,123
Current liabilities:
Accounts payable	2,315	4,599
Accrued liabilities	6,094	2,150
Common stock warrant liability	13,468	16,405
Deferred rent	0	6
Capital lease liability - current	18	8
Total current liabilities	21,895	23,168
Note payable	50,000	25,000
Capital lease liability - long-term	51	11
Total liabilities	71,946	48,179
Commitments and contingencies - see Note 8
Stockholders' equity:
Preferred stock, $0.001 par value per share,15,000,000 shares authorized, zero shares issued and outstanding	0	0
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
Additional paid-in capital	197,534	155,945
Accumulated other comprehensive loss	(204)	(115)
Accumulated deficit	(175,986)	(135,938)
Total stockholders' equity	21,402	19,944
Total liabilities and stockholders' equity	$ 93,348	$ 68,123