Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions		2 Months Ended	9 Months Ended		17 Months Ended	24 Months Ended
	Apr. 12, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Mar. 09, 2016	Sep. 30, 2016	Aug. 02, 2016	Mar. 10, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares repurchased, authorized amount							$ 6,000,000		$ 13,500,000	$ 13,500,000
Shares repurchased, increased authorized amount							$ 4,000,000
Repurchase of common stock paid			$ 23,843,474	$ 4,567,501
Common stock repurchased (in shares)		1.6			4.9	6.5
Stock repurchased, aggregate price		$ 6,000,000			$ 11,500,000	$ 17,500,000
Remaining shares available for purchase, value					$ 2,000,000
Modified "Dutch auction" tender offer
Shares repurchased, authorized amount								$ 15,000,000
Share price (in dollars per share)	$ 3.60
Repurchase of common stock paid	$ 14,200,000
Common stock repurchased (in shares)	3.9
Modified "Dutch auction" tender offer | Maximum
Share price (in dollars per share)								$ 3.60
Modified "Dutch auction" tender offer | Minimum
Share price (in dollars per share)								$ 3.20