Business Combinations - Additional Information (Detail) - USD ($)			1 Months Ended	9 Months Ended		12 Months Ended
	May 09, 2018	Feb. 14, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2017
Business Acquisition [Line Items]
Decrease in accounts receivable				$ 202,000	$ (1,197,000)
Goodwill				5,781,000
3VR
Business Acquisition [Line Items]
Date of acquisition completed		Feb. 14, 2018
Business combination, aggregate consideration		$ 6,200,000
Business combination, Payment of cash		1,600,000
Business combination, issuance of notes		$ 2,000,000
Business combination, issuance of common stock, shares		609,830
Business combination, issuance of common stock		$ 2,300,000
Business combination, issuance of common stock value held back	$ 300,000
Business combination, issuance of common stock shares held back	93,406	294,927
Reduction in purchase consideration	$ 660,000
Reduction in goodwill	$ 660,000
Business combination, cancellation of common stock shares held back	181,319
Product shipments have to be achieved to obligate earn-out consideration		$ 24,100,000
Amount of earn-out consideration of payable in shares of common stock		3,500,000
Potential maximum earn-out value		7,000,000
Amount of shipments should exceed to obligate potential maximum earn-out value		48,200,000
Decrease in accounts receivable			$ 561,000,000
Goodwill		5,781,000		5,781,000
3VR | ASC 805
Business Acquisition [Line Items]
Acquisition and transitional costs				$ 548,000			$ 212,000
3VR | Scenario, Forecast
Business Acquisition [Line Items]
Percentage of contingent consideration obligated to pay						35.00%
Amount of contingent consideration obligated to pay for each subject adjustments						$ 25,000,000
3VR | Maximum
Business Acquisition [Line Items]
Business combination, issuance of common stock value held back		$ 1,000,000