Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Additional disclosure
Total unrecognized compensation cost related to unvested stock-based compensation granted (in dollars)	$ 741,772
Weighted-average period over which unrecognized compensation expense is expected to be recognized	1 year 6 months
Options
Unvested options, Number of Shares
Unvested at the beginning of the period (in shares)	209,925
Options granted (in shares)	10,000
Options cancelled (in shares)	(4,900)
Options vested (in shares)	(16,125)
Unvested at the end of the period (in shares)	198,900
Unvested options, Weighted Average Grant Date Value
Unvested at the beginning of the period (in dollars per share)	$ 4.04
Options granted (in dollars per share)	$ 4.45
Options cancelled (in dollars per share)	$ 3.78
Options vested (in dollars per share)	$ 4.45
Unvested at the end of the period (in dollars per share)	$ 4.03
Additional disclosure
Fair value of option shares vested	$ 71,756	$ 65,697