Accrued Liabilities - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Employee compensation	$ 8,039	$ 6,838
Royalties payable	828	632
Construction related costs for leasehold improvements	640	50
Clinical study costs	563	572
Sales, use and other taxes	551	543
Warranty reserves	299	503
Accounting and legal	427	297
Other accrued liabilities	834	968
Total accrued liabilities	$ 12,181	$ 10,403