CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net loss	$ (20,961,000)	$ (37,647,000)	$ (42,825,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,855,000	2,599,000	2,984,000
Stock-based compensation	22,867,000	20,271,000	24,456,000
Non-cash operating lease cost	2,482,000	2,308,000	1,575,000
Changes in valuation of warrant investment	0		2,183,000
Net loss on sale of available-for-sale securities	7,000	54,000	108,000
Unrealized gain on investments	(135,000)	(170,000)	(564,000)
Loss on disposal of fixed assets	3,000	65,000
Impairment charges for facilities consolidation	0	1,698,000
Non-cash interest expense	398,000	374,000	609,000
Foreign currency remeasurement (gain) loss	(388,000)	(685,000)	1,911,000
Changes in operating assets and liabilities:
Accounts receivable	5,504,000	(1,102,000)	(9,200,000)
Inventories	7,030,000	(14,947,000)	(1,768,000)
Prepaid and other assets	(3,025,000)	(994,000)	1,168,000
Accounts payable	(1,477,000)	(7,335,000)	(4,905,000)
Accrued liabilities and other non-current liabilities	(2,198,000)	(9,070,000)	(1,263,000)
Deferred revenue	(603,000)	1,413,000	(84,000)
Net cash provided by (used in) operating activities	11,359,000	(43,168,000)	(25,615,000)
Investing activities
Capital expenditures	(2,837,000)	(4,597,000)	(2,000,000)
Purchases of investments	(42,975,000)	(2,486,000)	(29,640,000)
Proceeds from maturities and sale of investments	37,682,000	15,707,000	40,104,000
Net cash (used in) provided by investing activities	(8,130,000)	8,624,000	8,464,000
Financing activities
Net proceeds from equity incentives	804,000	925,000	4,084,000
Net costs from public offerings	(137,000)	(175,000)	(104,000)
Net (payments on) proceeds from revolving line of credit	(703,000)	5,091,000	212,000
Proceeds from loans, net of issuance costs	5,000,000	4,832,000
Net cash provided by financing activities	4,964,000	10,673,000	4,192,000
Effect of exchange rates on cash, cash equivalents, and restricted cash	(191,000)	(128,000)	(727,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash	8,002,000	(23,999,000)	(13,686,000)
Cash, cash equivalents and restricted cash, beginning of period	13,359,000	37,358,000	51,044,000
Cash, cash equivalents and restricted cash, end of period	21,361,000	13,359,000	37,358,000
Supplemental disclosure of cash flow information:
Cash paid for interest	9,295,000	9,210,000	5,100,000
Cash paid for income taxes	$ 356,000	$ 322,000	$ 270,000