Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (23,533)	$ (21,699)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,182	2,059
Amortization of right-of-use assets	1,303	1,418
Amortization of intangible assets	198	148
Amortization of debt discount and deferred financing fees	667	384
Provision for bad debt	566	(145)
Provision for inventory write-down	1,381	2,850
Change in fair value of derivatives	(1,155)	152
Investment losses	44	49
Stock-based compensation	11,437	9,410
Change in operating assets and liabilities:
Accounts receivable	(3,695)	(804)
Inventory	(3,804)	(5,774)
Prepaid expenses and other	(828)	1,146
Accounts payable and accrued expenses	(870)	(927)
Operating lease obligations	(1,320)	(154)
Cash paid for interest portion of finance leases	(1)	(1)
Contract and other liabilities	0	(3)
Net cash used in operating activities	(17,428)	(11,891)
Cash flows from investing activities:
Purchase of property and equipment	(13,456)	(20,641)
Economic development grant proceeds	0	950
Purchase of investments	(24,607)	(39,139)
Proceeds from sale of investments	37,100	49,300
Cash payments for intangible assets	(1,028)	(534)
Net cash used in investing activities	(1,991)	(10,064)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0	15,000
Cash paid for debt portion of finance leases	(9)	(12)
Proceeds from exercise of stock options and ESPP stock purchases	990	4,421
Net cash provided by financing activities	981	19,409
Net decrease in cash, cash equivalents, and restricted cash	(18,438)	(2,546)
Cash, cash equivalents, and restricted cash, beginning of period	39,007	55,609
Cash, cash equivalents, and restricted cash, end of period	20,569	53,063
Supplemental disclosures of cash flow activity:
Cash paid for interest, net of capitalized interest	0	646
Supplemental disclosure of non-cash investing and financing activities:
Acquisition of fixed assets in accounts payable and accrued expenses	2,090	1,460
Obtaining a right-of-use asset in exchange for a lease liability	920	1,375
Obtaining of property and equipment in exchange for a lease liability	22	0
Embedded derivative associated with the long-term debt	0	1,173
Acquisition of intangible assets in accounts payable and accrued expenses	$ 177	$ 261