v3.20.4
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net loss $ (44,836) $ (39,612) $ (27,897)
Adjustments to reconcile net loss to net cash used by operating activities:      
Depreciation and amortization 1,869 1,607 1,081
Stock-based compensation 4,971 9,175 4,385
Changes in operating assets and liabilities:      
Accounts receivable (3,765) (1,122)  
Due to/from related parties (211) (882) 676
Inventory 1,211 (2,594)  
Prepaid expenses and other current assets (3,122) 493 (726)
Accounts payable (148) 259 (118)
Accrued expenses 347 537 985
Accrued compensation (231) 876 360
Other current liabilities (70) (670) 940
Other 313 (18) 112
Net cash used by operating activities (43,672) (31,951) (20,202)
Investing activities      
Purchases of land, buildings, and equipment (1,786) (2,969) (1,847)
Short-term investments (11,698)    
Net cash used by investing activities (13,484) (2,969) (1,847)
Financing activities      
Proceeds from common stock issuance 15,000   57,706
Costs incurred related to the issuance of stock (963)   (665)
Proceeds from Payroll Protection Program loan 1,518    
Repayments of financing lease obligations (360) (275)  
Proceeds from the exercise of stock options 212 344 2,622
Costs incurred related to shares withheld for net settlement   (813) (230)
Proceeds from sale and leaseback of land, buildings, and equipment   414 1,240
Net cash (used) provided by financing activities 15,407 (330) 60,673
Net (decrease) increase in cash, cash equivalents and restricted cash (41,749) (35,250) 38,624
Cash, cash equivalents and restricted cash - beginning of period 60,038 95,288 56,664
Cash, cash equivalents and restricted cash - end of period $ 18,289 $ 60,038 $ 95,288

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