Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Aug. 31, 2012	Aug. 31, 2011
Current assets:
Cash and cash equivalents	$ 36,313	$ 23,580	$ 15,172
Restricted cash	163	169	114
Short-term investments	22,096	15,307	0
Prepaid expenses and other	1,610	3,111	416
Total current assets	60,182	42,167	15,702
Intangible assets, net	2,156	2,205	3,251
Goodwill	3,275	3,275	3,275
Fixed assets, net	416	403	77
Deposits	26	105	105
Other Assets	2,068	134	152
Total assets	68,123	48,289	22,562
Current liabilities:
Accounts payable	4,599	1,601	847
Accrued liabilities	2,150	2,652	2,249
Common stock warrant liability	16,405	17,266	23,575
Deferred rent	6	14	24
Capital lease liability - current	8	8	4
Total current liabilities	23,168	21,541	26,699
Note payable	25,000	0	0
Capital lease liability - long-term	11	13	10
Total liabilities	48,179	21,554	26,709
Commitments and contingencies
Stockholders' equity (deficit):
Preferred stock, $0.001 par value, 15,000,000 shares authorized, zero shares issued and outstanding	0	0	0
Common stock, $0.001 par value, 150,000 shares authorized, 52,425, 50,568 and 35,569 shares issued and outstanding at December 31, 2012, August 31, 2012 and 2011, respectively	52	51	36
Additional paid-in capital	155,945	143,380	73,817
Accumulated other comprehensive loss	(115)	(50)	2
Deficit accumulated during development stage	(135,938)	(116,646)	(78,002)
Total stockholders' equity (deficit)	19,944	26,735	(4,147)
Total liabilities and stockholders' equity	$ 68,123	$ 48,289	$ 22,562