CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss	$ (34,788)	$ (34,138)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,109	1,620
Amortization intangible assets	420	398
Amortization of right-of-use lease assets	726	714
Stock-based compensation	1,448	1,175
Provision for excess and obsolete inventory	113	294
Change in fair value of warrant liabilities	176	(105)
Amortization of debt issuance costs	655	593
Loss on disposal of assets	2	64
Change in fair value of forward obligation	550	(478)
Change in fair value of contingent earnout	12	(478)
Provision for bad debt		8
Changes in operating assets and liabilities:
Accounts receivable, net	20	1,360
Inventory	(3,011)	344
Prepaid expenses and other assets	(575)	258
Accounts payable	20	(1,472)
Accrued expenses and other liabilities	(276)	(2,216)
Deferred revenue	(158)
Accrued compensation	(323)	709
Net cash used in operating activities	(33,880)	(30,872)
Investing activities:
Purchases of property and equipment	(485)	(824)
Acquisition of intangible assets	(1,297)
Net cash used in investing activities	(1,782)	(824)
Financing activities:
Proceeds from exercise of common stock options	175	41
Deferred financing costs	(450)
Payment of contingent consideration	(667)	(987)
Borrowing on Small Business Administration loan		5,138
Repayment on Small Business Administration loan		(5,138)
Principal repayments on finance lease	(35)	(30)
Payment of deferred offering costs	(1,335)
Net cash used in financing activities	(2,312)	(976)
Net decrease in cash and cash equivalents	(37,974)	(32,672)
Cash and cash equivalents at beginning of period	51,722	92,165
Cash and cash equivalents at end of period	13,748	59,493
Cash paid during the period for:
Interest	2,577	2,577
Supplemental schedule of non-cash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for lease liabilities	362	2,790
Lease liabilities recorded for operating lease right-of-use assets	(362)	(2,790)
Fair value of preferred stock warrants issued	2,134
Unpaid property and equipment purchases		$ 67
Deferred offering costs included in accrued expenses	538
Unpaid deferred financing costs	$ 50