Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Segment Customer Distributor	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer
Significant Accounting Policies [Line Items]
Reserves for excess and obsolete inventory	$ 1,395,000	$ 1,454,000
Number of Operating Segments	1
Number Of Distribution Centers	17
Number Of Customer Accounted For Ten Percent Or More Net Sales	0	0	0
Level 3 assets	0	0
Level 3 liabilities	0	0
Warranty period for retail customer	24 months
Warranty reserves	$ 762,000	$ 737,000
Stock Option
Significant Accounting Policies [Line Items]
Anti-dilutive shares excluded from the computation of diluted loss per share	101,000	279,000	433,000
Restricted Stock
Significant Accounting Policies [Line Items]
Anti-dilutive shares excluded from the computation of diluted loss per share	268,985	318,660	312,501
Leasehold Improvements | Minimum
Significant Accounting Policies [Line Items]
Leasehold improvements amortization Period	5 years
Leasehold Improvements | Maximum
Significant Accounting Policies [Line Items]
Leasehold improvements amortization Period	15 years