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Unaudited Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Revenues    
Product and service $ 209 $ 0
Collaborations 14 69
Grants 83 30
Total Revenues 306 99
Selling, general, and administrative expenses 4,622 3,695
Research and development expenses 4,142 2,814
Loss from Operations (8,458) (6,410)
Other Income (Expense)    
Change in fair value of warrant liabilities (38) (30)
Interest expense (3) 0
Interest income 8 7
Total Other Income (Expense) (33) (23)
Net Loss $ (8,491) $ (6,433)
Net loss per common share—basic and diluted $ (0.10) $ (0.08)
Weighted average shares used in computing net loss per common share—basic and diluted 82,993,966 78,241,373