Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net loss	$ (51,904)	$ (37,097)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	792	1,000
Amortization of bond premium		114
Amortization of operating lease right-of-use assets	907	982
Stock-based compensation expense	5,458	5,617
Change in fair value of derivative instrument	1,792	(1,010)
Change in fair value of derivative warrant liability	(179)
(Gain) loss on sales of marketable securities	2	(14)
(Gain) loss on issuance of Series A redeemable convertible preferred stock and derivative warrant liability	65
Impairment of property and equipment	30
Non-cash interest expense	1,613	2,803
Changes in operating assets and liabilities:
Accounts receivable	3,556	877
Prepaid expenses and other assets	356	(692)
Inventories	(815)	(1,915)
Accounts payable	(791)	523
Accrued expenses and other liabilities	61	619
Deferred revenue	(375)	9
Operating lease liabilities	(868)	(848)
Net cash used in operating activities	(40,300)	(29,032)
Cash flows from investing activities
Proceeds from maturities of marketable securities		15,251
Proceeds from sales of marketable securities	9,998
Purchases and manufacture of property and equipment	(303)	(261)
Net cash provided by investing activities	9,695	14,990
Cash flows from financing activities
Payment of employee restricted stock tax withholdings	(243)
Proceeds from issuance of shares from employee stock purchase plan and stock option exercises	139	328
Proceeds from issuance of common stock in public offerings, net of offering costs	28,110	19,968
Proceeds from issuance of Series A redeemable convertible preferred stock and derivative warrant liability	300
Net cash provided by financing activities	28,306	20,296
Net change in cash, cash equivalents and restricted cash	(2,299)	6,254
Cash, cash equivalents and restricted cash at beginning of period	23,796	17,344
Cash, cash equivalents and restricted cash at end of period	21,497	23,598
Supplemental disclosures of cash flow information
Cash paid for interest	2,916	2,815
Supplemental disclosures of noncash activities
Transfer of T2 owned instruments and components (from) to inventory	(482)	(729)
Deemed dividend on Series A redeemable convertible preferred stock	330
Right-of-use assets obtained in exchange for new operating lease liabilities	199
Purchases of property and equipment included in accounts payable and accrued expenses	$ 72	$ 80