Business Combinations - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Feb. 14, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 5,880,000	$ 5,880,000
3VR
Business Acquisition [Line Items]
Date of acquisition completed	Feb. 14, 2018	Feb. 14, 2018
Business combination, aggregate consideration	$ 6,900,000
Business combination, Payment of cash	1,600,000
Business combination, issuance of notes	$ 2,000,000
Business combination, issuance of common stock, shares	609,880
Business combination, issuance of common stock	$ 2,300,000
Business combination, issuance of additional common stock shares held back	294,927
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
Goodwill		$ 5,880,000
3VR | ASC 805
Business Acquisition [Line Items]
Acquisition and transitional costs		$ 485,000		$ 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	$ 1,000,000