v3.20.2
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (21,004) $ (15,893)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 158 206
Noncash interest expense 430 395
Amortization of intangible assets 228 228
Inventory excess and obsolescence charge 1,221 1,093
Change in fair value of warrants   4
Stock‑based compensation expense 1,486 183
Change in operating assets and liabilities:    
Accounts receivable 190 (983)
Inventory (664) (1,023)
Prepaid expenses and other assets 1,440 (35)
Accounts payable (1,675) (2,470)
Accrued expenses and other liabilities 831 (44)
Foreign currency remeasurement loss 7  
Net cash used in operating activities (17,352) (18,339)
Cash flows from investing activities:    
Proceeds from the sale and maturity of short-term investments 9,289  
Payment for intangible asset   (2,500)
Purchase of property and equipment (129) (164)
Net cash provided by (used in) investing activities 9,160 (2,664)
Cash flows from financing activities:    
Proceeds from underwritten public offering, net of underwriting discounts, commissions and offering costs 44,722  
Payment of initial public offering costs (522)  
Proceeds from issuance of Series B redeemable convertible preferred stock, net of offering costs   14,415
Proceeds from exercise of stock options 163 12
Net cash provided by financing activities 44,363 14,427
Effect of exchange rate on cash (6) (1)
Net increase (decrease) in cash and cash equivalents 36,165 (6,577)
Cash and cash equivalents, beginning of period 45,302 17,278
Cash and cash equivalents, end of period 81,467 10,701
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest 2,231 2,330
Supplemental disclosures of noncash investing and financing activities:    
Accretion of redeemable convertible preferred stock   6,843
Offering costs in accounts payable and accrued expense and other current liabilities   1,731
Property and equipment in accounts payable 4  
Deferred Series B equity costs in accounts payable and accrued expenses   24
Issuance of common stock for early exercised stock options $ 2 $ 3