Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary of stock-based compensation expense [Abstract]
Total stock-based compensation expense	$ 190,000	$ 193,500	$ 580,500	$ 759,000
Weighted Average Exercise Price [Roll Forward]
Shares fully vested (in shares)	8,035,144		8,035,144
Shares expected to vest in future (in shares)	3,906,226		3,906,226
Shares expected to be forfeited (in shares)	132,189		132,189
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding - Beginning of Period (in shares)	13,134,398		14,174,000
Granted (in shares)	23,000		23,000
Exercised (in shares)	(1,006,094)		(1,757,472)
Forfeited or expired (in shares)	(77,745)		(232,151)
Cancellation of unearned performance option (in shares)			(133,818)
Outstanding - End of Period (in shares)	12,073,559		12,073,559
Weighted Average Exercise Price [Roll Forward]
Outstanding - Beginning of Period (in dollars per share)	$ 0.20		$ 0.20
Granted (in dollars per share)	$ 0.44		$ 0.44
Exercised (in dollars per share)	$ 0.19		$ 0.17
Forfeited or expired (in dollars per share)	$ 0.20		$ 0.20
Cancellation of unearned performance option (in dollars per share)			$ 0.19
Outstanding - End of Period (in dollars per share)	$ 0.20		$ 0.20
Weighted Average Remaining Contractual Terms	6 years 3 months		6 years 3 months
Aggregate Intrinsic Value	4,065,900		4,065,900
Unrecognized compensation cost	239,100		239,100
Weighted-average period, compensation cost not yet recognized			9 months
Stock option vesting term			33 months
Restricted Stock [Member]
Weighted Average Exercise Price [Roll Forward]
Unrecognized compensation cost	918,400		918,400
Weighted-average period, compensation cost not yet recognized			26 months
Stock option vesting term			3 months
Number of Shares [Abstract]
Unreleased - Beginning of Period (in shares)	3,796,324		4,043,123
Awarded (in shares)	1,027,500		1,607,500
Released (in shares)	(432,521)		(1,208,412)
Forfeited (in shares)	(265,157)		(316,065)
Unreleased - End of Period (in shares)	4,126,146		4,126,146
Weighted Average Grant Date Fair Value [Abstract]
Unreleased - Beginning of Period (in dollars per share)	$ 0.22		$ 0.18
Awarded (in dollars per share)	$ 0.42		$ 0.42
Released (in dollars per share)	$ 0.23		$ 0.21
Forfeited (in dollars per share)	$ 0.27		$ 0.36
Unreleased - End of Period (in dollars per share)	$ 0.26		$ 0.26
Weighted Average Remaining Recognition Period	2 years 1 month 24 days		2 years 1 month 24 days
Unrecognized Compensation Cost Remaining	918,400		918,400
Costs of Revenue [Member]
Summary of stock-based compensation expense [Abstract]
Total stock-based compensation expense	(500)	6,700	3,300	17,100
Selling and Marketing Expense [Member]
Summary of stock-based compensation expense [Abstract]
Total stock-based compensation expense	39,800	33,200	118,700	84,800
General and Administrative Expense [Member]
Summary of stock-based compensation expense [Abstract]
Total stock-based compensation expense	76,300	71,000	255,800	404,700
Research and Development Expense [Member]
Summary of stock-based compensation expense [Abstract]
Total stock-based compensation expense	$ 74,400	$ 82,600	$ 202,700	$ 252,400