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Summary of Significant Accounting Policies - Roll Forward of Goodwill Activity by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Ending Balance	$ 8,362	$ 8,362
Operating Segments [Member]
Goodwill [Line Items]
Impairment			$ (19,716)
Fair value allocation	21,109
Accumulated impairment	(19,716)		(26,828)
Accumulated Goodwill	6,969		47,937
Acquisition measurement period adjustments			116
Sale of MRI assets			(394)
Goodwill, Ending Balance	8,362	8,362	8,362
Operating Segments [Member] \| DermEbx And Radion [Member]
Goodwill [Line Items]
Acquisition cost			6,154
Operating Segments [Member] \| VuComp M-Vu Breast Density Product [Member]
Goodwill [Line Items]
Acquisition cost			1,093
Consolidated Reporting Unit [Member] \| Operating Segments [Member]
Goodwill [Line Items]
Fair value allocation	(21,109)		(21,109)
Accumulated impairment	(26,828)		(26,828)
Accumulated Goodwill	47,937		47,937
Detection [Member] \| Operating Segments [Member]
Goodwill [Line Items]
Fair value allocation	7,663		7,663
Accumulated Goodwill	699	0
Sale of MRI assets	0	0	(394)
Goodwill, Ending Balance	8,362	$ 8,362	8,362
Detection [Member] \| Operating Segments [Member] \| VuComp M-Vu Breast Density Product [Member]
Goodwill [Line Items]
Acquisition cost			1,093
Therapy [Member]
Goodwill [Line Items]
Goodwill, Ending Balance			5,700
Therapy [Member] \| Operating Segments [Member]
Goodwill [Line Items]
Impairment			(19,716)
Fair value allocation	13,446		13,446
Accumulated impairment	(19,716)
Accumulated Goodwill	$ 6,270
Acquisition measurement period adjustments			116
Therapy [Member] \| Operating Segments [Member] \| DermEbx And Radion [Member]
Goodwill [Line Items]
Acquisition cost			$ 6,154