Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2012	$ 32,696	$ 241	$ 43,722	$ (11,267)
Beginning balance (in shares) at Dec. 31, 2012		24,124,625
Issuance of common stock upon exercise of stock options	1,110	10	1,100	0
Issuance of common stock upon exercise of stock options (in shares)		945,761
Value of share-based arrangements	122	0	122	0
Value of share-based arrangements (in shares)		0
Net loss	(5,842)	0	0	(5,842)
Ending balance at Dec. 31, 2013	28,086	251	44,944	(17,109)
Ending balance (in shares) at Dec. 31, 2013		25,070,386
Sale of common stock	15,616	69	15,547	0
Sale of common stock (in shares)		6,900,000
Issuance of common stock upon exercise of stock options and warrants	309	3	306	0
Issuance of common stock upon exercise of stock options and warrants (in shares)		341,890
Value of share-based arrangements	708	0	708	0
Value of share-based arrangements (in shares)		0
Net loss	(720)	0	0	(720)
Ending balance at Dec. 31, 2014	$ 43,999	$ 323	$ 61,505	$ (17,829)
Ending balance (in shares) at Dec. 31, 2014		32,312,276