CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 12,212	$ 11,021
Cost of goods sold	4,807	4,325
Gross profit	7,405	6,696
Operating expenses:
Selling, general and administrative	8,179	6,349
Research and development	3,192	2,372
Change in fair value of contingent consideration	426	(1,561)
Depreciation and amortization	1,009	899
Total operating expenses	12,806	8,059
Loss from operations	(5,401)	(1,363)
Other income (expense):
Interest expense, net	(751)	(637)
Change in fair value of warrant liability	(1,870)
Other expense, net	(66)	(105)
Loss before provision for income taxes	(8,088)	(2,105)
Benefit (provision) for income taxes	6	(38)
Net loss	$ (8,082)	$ (2,143)
Net loss per share attributable to common stockholders, basic and diluted	$ (3.54)	$ (1.59)
Weighted-average shares outstanding, basic and diluted	2,706,133	2,288,875
Product
Revenue	$ 9,963	$ 8,929
Cost of goods sold	3,607	3,466
Service and other
Revenue	2,249	2,092
Cost of goods sold	$ 1,200	$ 859