Revenue by Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Revenues	$ 31,851	$ 34,044	$ 32,605	$ 33,493	$ 28,497	$ 30,637	$ 30,689	$ 29,239	$ 131,993	$ 119,062	$ 117,704
Fluid Delivery
Revenue from External Customer [Line Items]
Revenues									51,289	49,060	45,274
Cardiovascular
Revenue from External Customer [Line Items]
Revenues									40,182	36,021	34,072
Ophthalmology
Revenue from External Customer [Line Items]
Revenues									20,736	15,717	19,581
Other
Revenue from External Customer [Line Items]
Revenues									$ 19,786	$ 18,264	$ 18,777