Consolidated Statement of Stockholders' Equity (USD $)	Total	Common Stock	Treasury Stock	Additional Paid-In	Retained	Non-controlling Interest
Beginning at Dec. 31, 2012	$ 225,234,000	$ 275,000	$ (3,003,000)	$ 160,973,000	$ 66,939,000	$ 50,000
Treasury stock, shares at Dec. 31, 2012	(317,731)		(317,731)
Balance, shares at Dec. 31, 2012	27,530,220	27,530,221
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,636,000			1,636,000
Exercise of stock options	740,000	3,000		737,000
Contributions from non-controlling interest	33,000
Exercise of stock options, shares	135,607	135,607
Net income (loss)	(1,802,000)				(1,802,000)
Net Income (Loss) Attributable to Noncontrolling Interest	(56,000)					(56,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(1,858,000)
Beginning at Sep. 30, 2013	$ 225,785,000	$ 278,000	$ (3,003,000)	$ 163,346,000	$ 65,137,000	$ 27,000
Treasury stock, shares at Sep. 30, 2013	(317,731)		(317,731)
Balance, shares at Sep. 30, 2013	27,665,828	27,665,828