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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net loss $ (29,199) $ (44,836) $ (39,612)
Adjustments to reconcile net loss to net cash used by operating activities:      
Gain upon extinguishment of Payroll Protection Program Loan (1,528) 0 0
Depreciation and amortization 2,338 1,869 1,607
Stock-based compensation 2,090 4,971 9,175
Changes in operating assets and liabilities:      
Accounts receivable 4,887 (3,765) (1,122)
Due to/from related parties (594) (211) (882)
Inventory 1,383 1,211 (2,594)
Prepaid expenses and other current assets 3,331 (3,122) 493
Accounts payable (360) (148) 259
Accrued expenses (2,542) 347 537
Accrued compensation 572 (231) 876
Other 811 243 (688)
Net cash used by operating activities (18,811) (43,672) (31,951)
Investing activities      
Sales and (purchases) of short-term investments, net 11,698 (11,698) 0
Purchases of land, buildings, and equipment (497) (1,786) (2,969)
Net cash provided (used) by investing activities 11,201 (13,484) (2,969)
Financing activities      
Proceeds from common stock issuance 4,380 15,000 0
Costs incurred related to the issuance of stock (501) (963) 0
Proceeds from Payroll Protection Program loan 0 1,518 0
Repayments of financing lease obligations (364) (360) (275)
Proceeds from the exercise of stock options 227 212 344
Costs incurred related to shares withheld for net settlement 0 0 (813)
Proceeds from sale and leaseback of land, buildings, and equipment 0 0 414
Net cash provided (used) by financing activities 3,742 15,407 (330)
Net decrease in cash, cash equivalents, and restricted cash (3,868) (41,749) (35,250)
Cash, cash equivalents and restricted cash - beginning of period 18,289 60,038 95,288
Cash, cash equivalents and restricted cash - end of period $ 14,421 $ 18,289 $ 60,038