Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income	$ 1,938	$ 3,024
Less: Net income allocated to unvested participating securities	33	56
Net income available to common stockholders	$ 1,905	$ 2,968
Denominator:
Denominator for basic earnings per share— weighted average shares	6,002	5,751
Effect of dilutive securities:
Stock options	12	8
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions	6,014	5,759
Basic earnings per share	$ 0.32	$ 0.52
Diluted earnings per share	$ 0.32	$ 0.52