Revenue - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Non-current deferred revenue	$ 360,000		$ 360,000		$ 412,000
Total contract assets	0		0		$ 0
Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	14,061,000	$ 13,536,000	26,359,000	$ 22,067,000
Revision of Prior Period, Reclassification, Adjustment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer				1,900,000
Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,461,000	1,464,000	$ 2,593,000	2,886,000
Warranty term (in years)			1 year
Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,667,000	1,663,000	$ 3,346,000	3,309,000
Diagnostic Services | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,111,000	2,817,000	5,675,000	5,032,000
Diagnostic Services | Revision of Prior Period, Reclassification, Adjustment | Services and goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer				(1,900,000)
Diagnostic Services | Camera
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,461,000	1,464,000	2,593,000	2,886,000
Diagnostic Services | Camera Support
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,667,000	$ 1,663,000	$ 3,346,000	$ 3,309,000
Healthcare | Camera Support | Minimum
Disaggregation of Revenue [Line Items]
Service contract term (in months)			12 months
Healthcare | Camera Support | Maximum
Disaggregation of Revenue [Line Items]
Service contract term (in months)			48 months