Stock-Based Compensation (Details 2)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding (in shares) | shares	4,330,113
Weighted Average Exercise Price (in dollars per share)	$ 5.12
Weighted Average Remaining Contractual Life	6 years 9 months
Stock Options Exercisable (in shares) | shares	2,949,806
Weighted Average Exercise Price (in dollars per share)	$ 3.87
$0.79 - $1.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit (in dollars per share)	0.79
Exercise Price Range, Upper Range Limit (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 6 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]
Exercise Price Range, Lower Range Limit (in dollars per share)	1.01
Exercise Price Range, Upper Range Limit (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 7 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]
Exercise Price Range, Lower Range Limit (in dollars per share)	1.51
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 10.67
Stock Options Outstanding (in shares) | shares	2,584,113
Weighted Average Exercise Price (in dollars per share)	$ 7.86
Weighted Average Remaining Contractual Life	8 years 2 months 12 days
Stock Options Exercisable (in shares) | shares	1,203,806
Weighted Average Exercise Price (in dollars per share)	$ 7.94