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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows From Operating Activities    
Net loss $ (8,491) $ (6,433)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 135 96
Change in fair value of warrant liabilities 38 30
Stock-based compensation 1,780 1,537
Amortization of warrants issued for services (95) 141
Increase (decrease) in cash resulting from changes in:    
Accounts receivable (132) (60)
Inventory (3) (8)
Prepaid expenses and other assets 256 117
Accounts payable (357) 513
Accrued expenses (611) 460
Deferred rent (8) 112
Deferred revenue 1,193 130
Net cash used in operating activities (6,295) (3,365)
Cash Flows From Investing Activities    
Purchases of fixed assets (1,135) (238)
Net cash used in investing activities (1,135) (238)
Cash Flows From Financing Activities    
Proceeds from issuance of common stock and exercise of warrants, net 43,214 224
Proceeds from exercise of stock options 77 111
Principal payments on capital lease obligations (3) (2)
Net cash provided by financing activities 43,288 333
Net Increase (Decrease) in Cash and Cash Equivalents 35,858 (3,270)
Cash and Cash Equivalents at Beginning of Period 50,142 48,167
Cash and Cash Equivalents at End of Period 86,000 44,897
Supplemental Disclosure of Cash Flow Information:    
Interest 0 0
Income Taxes $ (3) $ 0