Significant Accounting Policies and Related Matters - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Remaining prior period of expiration for return of product		18 months
Remaining prior period of expiration for return of product for hospital customers		12 months
Maximum number of days for product return of shipment		30 days
Cash and cash equivalents with maturity dates		90 days
Accounts receivable		$ 15,000,000	$ 13,191,000
Percentage of goodwill impairment		50.00%
Impairment charges of goodwill		$ 0	0	$ 0
Retained earnings, net of tax	$ 100,000		72,000
Reclassification out of comprehensive income		0	0
Accumulated other comprehensive loss foreign currency translation adjustment losses		$ 2,300,000	$ 4,600,000
Commitment to a termination or exit plan		12 months
Foreign Deposits [Member]
Concentration Risk [Line Items]
Cash balances held outside United States		$ 11,800,000
Maximum [Member]
Concentration Risk [Line Items]
Cash balances insured by the FDCIC		$ 250,000
Intangible assets useful lives		13 years
Minimum [Member]
Concentration Risk [Line Items]
Intangible assets useful lives		1 year
United States [Member] | Maximum [Member]
Concentration Risk [Line Items]
Accounts receivable due period		90 days
United States [Member] | Minimum [Member]
Concentration Risk [Line Items]
Accounts receivable due period		30 days
Europe [Member] | Maximum [Member]
Concentration Risk [Line Items]
Accounts receivable due period		240 days
Europe [Member] | Minimum [Member]
Concentration Risk [Line Items]
Accounts receivable due period		90 days
Italy [Member]
Concentration Risk [Line Items]
Accounts receivable		$ 1,100,000
Spain [Member]
Concentration Risk [Line Items]
Accounts receivable		$ 600,000