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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Cash flows from operating activities:      
Net loss $ (23,134) $ (19,901)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation expense 35 17  
Stock-based compensation expense 4,905 27  
Non-cash interest expense - related party 121 722  
Changes in operating assets and liabilities, net of impact of assumed net assets of Macrocure:      
Prepaid expenses and other assets (148) (268)  
Research and development incentive receivable 1,318    
Accounts payable and accrued expenses 1,135 1,363  
Net cash used in operating activities (15,768) (18,040)  
Cash flows from investing activities:      
Purchases of property and equipment (64) (136)  
Net cash used in investing activities (64) (136)  
Cash flows from financing activities:      
Proceeds from issuance of common stock in connection with merger with Macrocure 21,165    
Proceeds from the sale of common stock 10,000    
Proceeds from notes payable - related party 750 18,900  
Proceeds from the exercise of stock options 20    
Payment of deferred offering costs (2,067)    
Net cash provided by financing activities 29,868 18,900  
Effect of exchange rate changes on cash and cash equivalents (626) (164)  
Net increase in cash and cash equivalents 13,410 560  
Cash and cash equivalents at beginning of period 793 405 $ 405
Cash and cash equivalents at end of period 14,203 965 $ 793
Supplemental disclosure of non-cash financing activities:      
Accretion of preferred stock to redemption value (244) (3,483)  
Deferred offering costs included in accounts payable and accrued expenses   $ 522  
Conversion of notes payable - related party and accrued interest into common stock 31,145    
Conversion of convertible preferred stock into common stock 70,775    
Value of net assets acquired in connection with merger with Macrocure, excluding cash $ 96