Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ 10,044 $ 3,552
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 225 45
Depreciation and amortization 33 23
Change in fair value of warrant liability 5,450  
Net amortization/accretion of premiums and discounts on short-term investments (121)  
Changes in operating assets and liabilities:    
Research and development incentives receivable (438) (468)
Prepaid expenses and other current assets (220) (1,256)
Accounts payable (259) 381
Accrued expenses and other current liabilities (1,479) (660)
Deferred rent (6) (6)
Net cash used in operating activities (6,859) (5,493)
Cash flows from investing activities:    
Purchases of property, plant and equipment (116) (33)
Purchases of short-term investments (10,744)  
Sales and maturities of short-term investments 15,750  
Net cash provided by (used in) investing activities 4,890 (33)
Cash flows from financing activities:    
Payment of issuance costs (195)  
Net cash used in financing activities (195)  
Effect of exchange rate changes on cash and cash equivalents (731) 898
Net decrease in cash (2,895) (4,628)
Cash, cash equivalents and restricted cash at beginning of period 17,661 20,669
Cash, cash equivalents and restricted cash at end of period 14,766 $ 16,041
Supplemental disclosure of non-cash investing and financing activities:    
Deferred offering costs included in accounts payable 1,149  
Purchases of property and equipment included in accounts payable $ 21