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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash Flows from Operating Activities:        
Net loss   $ (17,954) $ (11,135)  
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization   671 455  
Share-based compensation   1,364 295  
Non-cash interest expense   642 542  
Change in fair value of convertible preferred stock warrant liability   1,396 (250)  
Cost of rental units purchased by customers   148 118  
Changes in certain assets and liabilities:        
Accounts receivable, net   (1,016) (326)  
Inventory   (767) (519)  
Prepaid expenses and other assets   (298) (30)  
Accounts payable   (594) (819)  
Accrued expenses   (1,461) 331  
Deferred revenue   (400) (45)  
Deferred rent   (46) (29)  
Net Cash Used in Operating Activities   (18,315) (11,412) $ (11,100)
Cash Flows from Investing Activities:        
Purchases of property and equipment and capitalized software   (650) (319)  
Net Cash Used in Investing Activities   (650) (319)  
Cash Flows from Financing Activities:        
Proceeds from issuance of common stock in initial public offering   99,998    
Payments of public offering costs $ (3,465) (3,465)    
Proceeds from exercises of stock options   45 30  
Proceeds from issuance of Series G convertible preferred stock, net     14,825  
Borrowings under credit facilities     5,000  
Payments of debt issuance costs     (1,015)  
Net Cash Provided by Financing Activities   96,578 18,840  
Net Increase in Cash and Cash Equivalents   77,613 7,109  
Cash and Cash Equivalents, Beginning of Period   29,147 17,040 17,040
Cash and Cash Equivalents, End of Period $ 106,760 106,760 24,149 $ 29,147
Supplemental disclosure of cash flow information:        
Cash paid for interest   2,057 1,492  
Transfer of inventory to property and equipment   235 248  
Supplemental disclosure of non-cash financing activities:        
Allocation of proceeds from debt financing to convertible preferred stock warrant liability     $ 171  
Conversion of convertible preferred stock into common stock   187,136    
Conversion of convertible preferred stock warrants into common stock warrants   $ 1,874