Stock-Based Compensation (Details 2)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in shares) | shares	4,318,177
Weighted Average Exercise Price (in dollars per share)	$ 5.11
Weighted Average Remaining Contractual Life	6 years 6 months 10 days
Stock Options Exercisable (in shares) | shares	2,981,134
Weighted Average Exercise Price (in dollars per share)	$ 3.91
$0.79 - $1.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	0.79
Range of Exercise Prices (in dollars per share)	$ 1.00
Stock Options Outstanding (in shares) | shares	25,000
Weighted Average Exercise Price (in dollars per share)	$ 0.79
Weighted Average Remaining Contractual Life	2 years 3 months 4 days
Stock Options Exercisable (in shares) | shares	25,000
Weighted Average Exercise Price (in dollars per share)	$ 0.79
$1.01 - $1.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	1.01
Range of Exercise Prices (in dollars per share)	$ 1.50
Stock Options Outstanding (in shares) | shares	1,721,000
Weighted Average Exercise Price (in dollars per share)	$ 1.06
Weighted Average Remaining Contractual Life	4 years 4 months 21 days
Stock Options Exercisable (in shares) | shares	1,721,000
Weighted Average Exercise Price (in dollars per share)	$ 1.06
$1.51 - $10.67
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	1.51
Range of Exercise Prices (in dollars per share)	$ 10.67
Stock Options Outstanding (in shares) | shares	2,572,177
Weighted Average Exercise Price (in dollars per share)	$ 7.87
Weighted Average Remaining Contractual Life	7 years 12 months 2 days
Stock Options Exercisable (in shares) | shares	1,235,134
Weighted Average Exercise Price (in dollars per share)	$ 7.93