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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (6,149) $ (7,475)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 2,157 1,769
Amortization 1,560 1,392
Reduction in carrying amount of right-of-use assets 808 706
Provision for (recoveries of) losses on accounts receivable (71) 67
Stock-based compensation 8,054 3,763
Deferred income taxes (11) 0
Gain on disposal of assets 0 (1)
Changes in operating assets and liabilities:    
Accounts receivable, net 121 (53)
Inventory (4,405) (3,572)
Prepaid expenses and other current assets 2,183 923
Other assets (428) (1,488)
Accounts payable 1,437 4,582
Accrued and other long-term liabilities (736) (2,247)
Deferred revenues 64 1,312
Lease liabilities (690) (705)
Non-current income taxes payable 221 (52)
Net cash provided by (used in) operating activities 4,115 (1,079)
Cash flows from investing activities:    
Acquisition of business, net of cash acquired (291) 0
Purchases of property, plant and equipment (3,134) (15,185)
Capitalization of patents (80) (320)
Proceeds from sale of assets 0 41
Net cash used in investing activities (3,505) (15,464)
Cash flows from financing activities:    
Proceeds from public offerings, net of offering costs 82,761 0
Proceeds from term loan 0 15,000
Principal payments on debt and financing leases (372) (16)
Proceeds from stock option exercises 574 558
Tax payments related to stock award issuances (31) (11)
Net cash provided by financing activities 82,932 15,531
Effect of exchange rate changes on cash (227) 10
Net increase (decrease) in cash, cash equivalents, and restricted cash 83,315 (1,002)
Cash, cash equivalents, and restricted cash, beginning of period 102,573 117,293
Cash, cash equivalents, and restricted cash, end of period 185,888 116,291
Supplemental disclosures:    
Cash paid (received) for interest 66 (384)
Cash paid for income taxes 241 605
Right-of-use assets obtained in exchange for lease liabilities 6,699 7,566
Accrued purchases of property, equipment and patents 1,698 744
Accrued offering costs $ 406 $ 0