Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 20,329	$ 15,350	$ 63,291	$ 39,837
Cost of revenue	7,745	5,718	25,855	15,711
Gross profit	12,584	9,632	37,436	24,126
Operating expense:
Selling, general and administrative	9,674	6,229	33,414	17,959
Research, development and engineering	2,920	1,615	7,647	4,717
Loss on sale of property and equipment	0	576	0	576
Total operating expense	12,594	8,420	41,061	23,252
Operating (loss)/income	(10)	1,212	(3,625)	874
Other income/(expense):
Investment income	0	1	0	65
Other income	0	13	0	19
Interest expense, net	(110)	(1)	(375)	(2)
Total other (expense)/income	(110)	13	(375)	82
(Loss)/income from continuing operations before income taxes	(120)	1,225	(4,000)	956
Income tax expense/(benefit)	224	(1,083)	(1,436)	(930)
Net (loss)/income from continuing operations	(344)	2,308	(2,564)	1,886
Income from discontinued operations, net of income tax of $235, $246, $381, and $673	699	794	2,371	1,469
Net income/(loss)	$ 355	$ 3,102	$ (193)	$ 3,355
Net (loss)/income per share from continuing operations:
Basic (in dollars per share)	$ (0.01)	$ 0.07	$ (0.08)	$ 0.06
Diluted (in dollars per share)	(0.01)	0.07	(0.08)	0.06
Net income per share from discontinued operations:
Basic (in dollars per share)	0.02	0.03	0.08	0.05
Diluted (in dollars per share)	0.02	0.02	0.07	0.05
Net income/(loss) per share attributable to common stockholders:
Basic (in dollars per share)	0.01	0.10	(0.01)	0.11
Diluted (in dollars per share)	$ 0.01	$ 0.10	$ (0.01)	$ 0.10
Weighted average shares:
Basic (in shares)	31,944,869	30,809,896	31,553,998	30,593,954
Diluted (in shares)	33,780,714	32,411,086	33,585,973	32,478,625