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Consolidated Statements of Cash Flows - USD ($)
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Cash flows from operating activities:      
Net loss $ (18,603,000) $ (11,436,000) $ (7,226,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation expense 40,000 33,000 38,000
Share-based compensation expense 394,000 118,000 36,000
Foreign currency exchange rate gain (1,371,000) (1,661,000)  
Changes in operating assets and liabilities, net of changes from business acquired:      
Research and development tax credit receivable (600,000) (1,148,000) (94,000)
Grants receivable 29,000 (137,000) 65,000
Prepaid expenses and other current assets (81,000) (475,000) 210,000
Accounts payable (1,599,000) 374,000 167,000
Accrued expenses (1,931,000) 1,176,000 436,000
Net cash used in operating activities (23,722,000) (13,156,000) (6,368,000)
Cash flows from investing activities:      
Cash acquired in Carbylan transaction 34,139,000    
Purchases of property and equipment (74,000) (11,000) (125,000)
Net cash provided by (used in) investing activities 34,065,000 (11,000) (125,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock 2,000 1,000 1,000
Net cash provided by financing activities 2,000 33,003,000 8,662,000
Effect of exchange rate changes on cash (1,159,000) (598,000) (124,000)
Net increase in cash and cash equivalents 9,186,000 19,238,000 2,045,000
Cash and cash equivalents, beginning year 21,764,000 2,526,000 481,000
Cash and cash equivalents, end of year 30,950,000 21,764,000 2,526,000
Supplemental disclosures of cash flow information:      
Conversion of preferred stock and ordinary shares to common stock $ 58,613,000    
Series A Preferred Stock [Member]      
Cash flows from financing activities:      
Proceeds from issuance of Preferred Stock, net of issuance costs     $ 8,661,000
Series B Preferred Stock [Member]      
Cash flows from financing activities:      
Proceeds from issuance of Preferred Stock, net of issuance costs   $ 33,002,000