Stockholders' Equity - Summary of Stock Option Activity Under All Option Plans (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
STOCKHOLDERS' EQUITY:
Number of shares, Outstanding, Beginning balance	1,344,300
Number of shares, Options Granted	19,734
Number of shares, Options Exercised
Number of shares, Options forfeited or expired	(121,200)
Number of shares, Outstanding, Ending balance	1,242,834	1,344,300
Number of shares, Options Exercisable	1,049,233
Options available for grants	1,408,866
Weighted Avg. Exercise Price, Outstanding, Beginning balance	$ 3.08
Weighted Avg. Exercise Price, Options Granted	$ 5.61
Weighted Avg. Exercise Price, Options Exercised
Weighted Avg. Exercise Price, Options forfeited or expired	$ 7.32
Weighted Avg. Exercise Price, Outstanding, Ending balance	$ 2.71	$ 3.08
Weighted Avg. Exercise Price, Exercisable Ending Balance	$ 2.26
Weighted Avg. Remaining Contractual Life, Options Outstanding	6 years 2 months 1 day	6 years 6 months 11 days
Weighted Avg. Remaining Contractual Life, Options Exercisable	6 years 6 months 7 days
Aggregate Intrinsic Value, Options Outstanding
Aggregate Intrinsic Value, Options Exercisable