Stock-Based Compensation - Stock Option Activity (Details) - Stock Options	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Stock Options [Roll Forward]
Beginning, outstanding (in shares) | shares	286,707
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Canceled (in shares) | shares	(40,213)
Forfeited (in shares) | shares	(6,602)
Ending, outstanding (in shares) | shares	239,892
Exercisable (in shares) | shares	210,943
Weighted Average Exercise Price [Roll Forward]
Beginning, outstanding (in dollars per share) | $ / shares	$ 77.50
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	0.00
Canceled (in dollars per share) | $ / shares	128.72
Forfeited (in dollars per share) | $ / shares	23.46
Ending, outstanding (in dollars per share) | $ / shares	70.41
Exercisable (in dollars per share) | $ / shares	$ 78.15