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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Cash Flows from Operating Activities    
Net loss $ (13,241) $ (8,334)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 248 153
Stock-based compensation expense 2,236 1,323
Realized (gain) loss from available for sale securities (129)  
Amortization of right of use assets 273  
Amortization of discount/premium on available for sale securities 79  
Foreign currency remeasurement (gain) loss (81) 226
Changes in operating assets and liabilities:    
Research and development tax credit receivable (577) (692)
Prepaid expenses and other current assets 785 (517)
Accounts payable (558) 2,088
Accrued expenses (564) 66
Lease obligations (271)  
Deferred revenue (7,289) (9,311)
Net cash used in operating activities (19,089) (14,998)
Cash Flows from Investing Activities    
Acquisition of property and equipment (212) (786)
Purchases of available for sale securities (42,561)  
Sales and maturities of available for sale securities 39,729  
Net cash used in investing activities (3,044) (786)
Cash Flows from Financing Activities    
Capital lease principal payments (54) (104)
Issuance of common stock from equity incentive plans 170 25
Issuance of common stock, net of $123 of offering expenses 11,422 87,811
Net cash from financing activities 11,538 87,732
Effect of exchange rate changes on cash and cash equivalents 308 (1,887)
Net (decrease) increase in cash and cash equivalents (10,287) 70,061
Cash and cash equivalents at beginning of period 32,006 51,055
Cash and cash equivalents at end of period $ 21,719 $ 121,116