Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Stock Options [Roll Forward]
Exercised (in shares)	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration term	10 years
Total unrecognized compensation expense related to non-vested stock | $	$ 0.6
Total compensation cost not yet recognized, period for recognition	2 years 7 months 6 days
Stock Options [Roll Forward]
Beginning, outstanding (in shares)	4,551,221
Granted (in shares)	20,000
Exercised (in shares)	0
Canceled (in shares)	(437,920)
Forfeited (in shares)	(264,207)
Ending, outstanding (in shares)	3,869,094
Exercisable (in shares)	2,867,618
Weighted Average Exercise Price [Roll Forward]
Beginning, outstanding (in dollars per share) | $ / shares	$ 9.02
Granted (in dollars per share) | $ / shares	0.83
Exercised (in dollars per share) | $ / shares	0.00
Canceled (in dollars per share) | $ / shares	17.06
Forfeited (in dollars per share) | $ / shares	1.46
Ending, outstanding (in dollars per share) | $ / shares	8.59
Exercisable (in dollars per share) | $ / shares	$ 11.06