Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Stock Options [Roll Forward]
Exercised (in shares)	(12,656)
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 | $	$ 0.1
Total compensation cost not yet recognized, period for recognition	1 year 2 months 12 days
Stock Options [Roll Forward]
Beginning, outstanding (in shares)	3,897,986
Granted (in shares)	24,547
Exercised (in shares)	(20,000)
Canceled (in shares)	(341,498)
Forfeited (in shares)	(47,307)
Ending, outstanding (in shares)	3,513,728
Exercisable (in shares)	3,323,969
Weighted Average Exercise Price [Roll Forward]
Beginning, outstanding (in dollars per share) | $ / shares	$ 13.07
Granted (in dollars per share) | $ / shares	3.94
Exercised (in dollars per share) | $ / shares	3.84
Canceled (in dollars per share) | $ / shares	24.84
Forfeited (in dollars per share) | $ / shares	7.08
Ending, outstanding (in dollars per share) | $ / shares	12.00
Exercisable (in dollars per share) | $ / shares	$ 12.46