Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Net income	$ 138	$ 1,785	$ 504	$ 4,037
Convertible preferred stock dividend and related accretion				(942)
Net income applicable to common stockholders	$ 138	$ 1,785	$ 504	$ 3,095
Denominator:
Basic weighted-average shares outstanding (in shares)	39,061,000	38,798,000	39,215,000	38,661,000
Add: dilutive effect of options and restricted stock (in shares)	2,421,000	1,097,000	1,698,000	999,000
Fully diluted weighted-average shares outstanding (in shares)	41,482,000	39,895,000	40,913,000	39,660,000
Basic net income per share applicable to common stockholders (in dollars per share)	$ 0.00	$ 0.05	$ 0.01	$ 0.08
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 0.00	$ 0.04	$ 0.01	$ 0.08
Anti-dilutive shares excluded from the denominator	794,721	3,803,142	951,621	3,815,642