Stockholders' Equity - Narrative (Details)												1 Months Ended			12 Months Ended
	Oct. 30, 2015 USD ($) shares	Aug. 04, 2015 USD ($) shares	Aug. 03, 2015 USD ($)	May. 13, 2015 USD ($) shares	May. 04, 2015 USD ($)	Feb. 19, 2015 USD ($)	Jan. 22, 2015 shares	Nov. 04, 2014 USD ($) shares	Nov. 18, 2007	Oct. 19, 2007 $ / shares shares	May. 04, 2007 $ / shares shares	Oct. 29, 2015 USD ($)	Apr. 30, 2015 USD ($) $ / shares shares	Dec. 17, 2014 USD ($) shares	Dec. 31, 2015 USD ($) class $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Jul. 28, 2015 USD ($)	Aug. 13, 2012 shares
Class of Stock [Line Items]
Number of classes of stock | class															2
Preferred stock, shares authorized															5,000,000	5,000,000
Preferred stock, par value (in dollars per share) | $ / shares															$ 0.001	$ 0.001
Common stock, shares authorized															50,000,000	50,000,000
Common stock, par value (in dollars per share) | $ / shares															$ 0.001	$ 0.001
Preferred stock, shares outstanding															0
Number of securities called by warrants										3,141,499			88,097			88,097
Term of warrant									5 years	1 year
Warrants, exercise price | $ / shares										$ 3.52					$ 3.5082
Proceeds from exercise of warrants | $															$ 309,000	$ 4,948,000
Authorized amount of shares to be repurchased | $					$ 5,000,000			$ 5,000,000									$ 15,000,000
Treasury stock, purchase price | $			$ 3,500,000		$ 3,500,000							$ 3,600,000		$ 3,000,000
Repurchase of common stock (in shares)	106,264	162,442		186,519										359,840
Repurchase of common stock | $	$ 5,000,000	$ 5,000,000		$ 5,000,000										$ 4,500,000	16,071,000	$ 4,661,000
Remaining authorized repurchase amount | $															$ 5,000,000
Number of shares authorized to be repurchased																		100,000
George K. Broady
Class of Stock [Line Items]
Repurchase of common stock (in shares)							91,817	1,500,000
Repurchase of common stock | $						$ 1,100,000
Shares repurchased per trading day							5,000
Seven Year Warrants
Class of Stock [Line Items]
Number of securities called by warrants										1,495,952						1,407,855
Term of warrant										7 years
Warrants, exercise price | $ / shares													$ 3.5043
Proceeds from exercise of warrants | $													$ 309,000			$ 4,900,000
One Year Warrants
Class of Stock [Line Items]
Number of securities called by warrants										1,495,952
Term of warrant										1 year
Five Year Warrants
Class of Stock [Line Items]
Number of securities called by warrants										149,595
Term of warrant										5 years
Warrants, exercise price | $ / shares										$ 3.52
Minimum | Seven Year Warrants
Class of Stock [Line Items]
Warrants, exercise price | $ / shares																$ 3.5108
Maximum | Seven Year Warrants
Class of Stock [Line Items]
Warrants, exercise price | $ / shares																$ 3.52
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding											1,761,900
Preferred stock, dividends per share, declared | $ / shares											$ 0.119
Share price | $ / shares											$ 1.70
Preferred stock, voting rights											0.729
Series A Preferred Stock | Minimum
Class of Stock [Line Items]
Share price | $ / shares											$ 10