Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock-based Compensation [Abstract]

Schedule of Weighted Average Assumptions

	Years Ended December 31,
	2015	2014	2013
Risk-free interest rate	0.96%	1.02%	0.49%
Time to maturity (in years)	3	4	4
Annualized volatility	57.59%	69.67%	30.30%
Expected dividend rate	0.00%	1.20%	0.98%

Schedule of Stock Options Activity

					Weighted
			Weighted		Average
			Average		Remaining	Aggregate
			Exercise		Contractual	Intrinsic
Options	Shares		Price		Life	Value
Outstanding at December 31, 2014	693,100		$	9.08
Granted	58,000			14.74
Exercised	(101,100	)		6.62
Forfeited	(78,400	)		11.88
Outstanding at December 31, 2015	571,600		$	9.71	7.75 Years	$	3,154,415
Vested and expected to vest at December 31, 2015	496,428		$	9.60	7.69 Years	$	2,796,239
Exercisable at December 31, 2015	164,167		$	6.95	6.27 Years	$	1,356,896

Schedule of Information Relating to Stock Options Outstanding

			Options Outstanding		Options Exercisable
				Weighted
				Average	Weighted					Weighted
Range of			Number	Remaining	Average			Number	Average
Exercise			Outstanding	Contractual	Exercise			Exercisable	Exercise
Price			As of 12/31/15	Term	Price			As of 12/31/15	Price
	$3.88 -	$4.80	111,700	6.22		$	4.28	85,000		$	4.41
	$5.05 -	$6.03	22,500	1.46		$	5.32	22,500		$	5.32
	$6.87 -	$6.87	96,000	7.29		$	6.87	13,800		$	6.87
	$8.17 -	$12.32	82,000	8.51		$	11.22	600		$	8.17
	$12.50 -	$12.50	201,400	8.19		$	12.50	37,600		$	12.50
	$13.61 -	$18.36	58,000	11.25		$	14.74	4,667		$	16.32
			571,600	7.75		$	9.71	164,167		$	6.95

Schedule of Information relating to the ESPP

	2015		2014		2013
Weighted average fair value per share of shares purchased	$	11.26	$	13.01	$	5.66
Total compensation expense for ESPP	$	324,250	$	461,980	$	409,079
Total amount of cash received from the purchase of stock through ESPP	$	672,899	$	660,621	$	521,308
Total intrinsic value of ESPP stock purchased at December 31	$	233,381	$	75,892	$	863,120

Schedule of Employee Stock-Based Compensation Expense

	Years Ended December 31,
	2015		2014		2013
Included in cost of revenue	$	513	$	491	$	373
Included in operating expenses:
Research and development		196		234		232
Sales, marketing and administrative		2,227		1,435		1,312
Total		2,423		1,669		1,544
Total stock-based compensation expenses	$	2,936	$	2,160	$	1,917