Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance at Dec. 31, 2013	$ 50,923	$ 50	$ 7	$ 41,498	$ 9,368
Balance, shares at Dec. 31, 2013		10	7,401
Exercise of stock options	1,319		$ 1	1,318
Exercise of stock options, shares			185
Issuance of restricted common stock, shares			204
Forfeiture of restricted common stock, shares			(13)
Purchase and retirement of common stock	(1,931)			(1,931)
Purchase and retirement of common stock, shares			(88)
Stock-based compensation	4,218			4,218
Tax impact from stock-based awards	(1,347)			(1,347)
Net loss	(6,651)				(6,651)
Cash dividends declared	(1,654)				(1,654)
Balance at Sep. 30, 2014	44,877	$ 50	$ 8	43,756	1,063
Balance, shares at Sep. 30, 2014		10	7,689
Balance at Dec. 31, 2014	52,174	$ 50	$ 8	60,222	(8,106)
Balance, shares at Dec. 31, 2014		10	8,427
Issuance of common stock, net of issuance costs	12,896		$ 1	12,895
Issuance of common stock, net of issuance costs, shares			342
Exercise of stock options	$ 1,321			1,321
Exercise of stock options, shares	91		91
Issuance of restricted common stock, shares			132
Forfeiture of restricted common stock, shares			(29)
Purchase and retirement of common stock	$ (1,833)			(1,833)
Purchase and retirement of common stock, shares			(57)
Stock-based compensation	3,994			3,994
Net loss	(12,631)				(12,631)
Balance at Sep. 30, 2015	$ 55,921	$ 50	$ 9	$ 76,599	$ (20,737)
Balance, shares at Sep. 30, 2015		10	8,906