Accrued Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Payables and Accruals [Abstract]
Payroll and related	$ 9,537,000	$ 7,653,000
Professional fees	1,400,000	1,916,000
Non-income taxes	3,223,000	84,000
Product warranty	578,000	1,006,000	1,126,000	861,000
Deferred rent	278,000	380,000
Derivative litigation costs	0	1,262,000
Derivative litigation settlement	1,241,000	1,573,000
Other	3,206,000	2,778,000
Total	19,463,000	16,652,000
Derivative litigation costs in excess of insurance limits	$ 1,900,000