Stock-Based Compensation - Restricted Stock (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Restricted Stock [Roll Forward]
Vested (in shares)	0
Restricted Stock
Restricted Stock [Roll Forward]
Beginning, nonvested (in shares)	1,162,776
Granted (in shares)	0
Vested (in shares)	(257,656)
Forfeited (in shares)	(84,656)
Ending, nonvested (in shares)	820,464
Weighted Average Grant Date Fair Value Per Share [Roll Forward]
Beginning, nonvested (in dollars per share) | $ / shares	$ 2.34
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	2.69
Forfeited (in dollars per share) | $ / shares	2.55
Ending, nonvested (in dollars per share) | $ / shares	$ 2.21
Total unrecognized compensation expense related to non-vested stock | $	$ 1.4
Total compensation cost not yet recognized, period for recognition	3 years 7 months 6 days