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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities    
Net loss $ (16,466) $ (18,792)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 706 376
Stock-based compensation 3,754 2,878
Non-cash operating lease cost 300 353
Loss on sale of available-for-sale securities 267  
Non-cash interest expense 119 197
Changes in operating assets and liabilities:    
Accounts receivable (1,283) (5,004)
Inventories (2,226) (2,286)
Other assets 1,119 2,165
Accounts payable (2,308) 2,597
Accrued liabilities and other non-current liabilities (4,356) (4,809)
Manufacturing and development obligations   (118)
Deferred product revenue 572 265
Net cash used in operating activities (19,802) (22,178)
Investing activities    
Capital expenditures (452) (3,315)
Purchases of investments (68,520) (1,000)
Proceeds from maturities and sale of investments 18,787 17,500
Net cash (used in) provided by investing activities (50,185) 13,185
Financing activities    
Net proceeds from equity incentives 1,193 710
Net proceeds from public offerings 67,695  
Net payment on revolving line of credit (204)  
Proceeds from loans   39,433
Repayment of debt   (31,010)
Net cash provided by financing activities 68,684 9,133
Net (decrease) increase in cash, cash equivalents and restricted cash (1,303) 140
Cash, cash equivalents and restricted cash, beginning of period 37,421 31,587
Cash, cash equivalents and restricted cash, end of period $ 36,118 $ 31,727