Stock Incentive Plans - Summary of Restricted Common Stock and Performance-Based Restricted Stock Unit Activity (Details)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Restricted Common Stock
Number of Shares
Unvested at the beginning of the period (in shares) | shares	639,329
Granted (in shares) | shares	521,784
Vested (in shares) | shares	(21,790)
Forfeited (in shares) | shares	(2,910)
Expired (in shares) | shares	0
Unvested at the end of the period (in shares) | shares	1,136,413
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share) | $ / shares	$ 14.40
Granted (in dollars per share) | $ / shares	19.80
Vested (in dollars per share) | $ / shares	(12.62)
Forfeited (in dollars per share) | $ / shares	(14.85)
Expired (in dollars per share) | $ / shares	(0.00)
Unvested at the end of the period (in dollars per share) | $ / shares	$ 16.91
Restricted Stock Units
Number of Shares
Unvested at the beginning of the period (in shares) | shares	705,600
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	(1,000)
Expired (in shares) | shares	(327,800)
Unvested at the end of the period (in shares) | shares	376,800
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share) | $ / shares	$ 12.41
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	(0.00)
Forfeited (in dollars per share) | $ / shares	(12.64)
Expired (in dollars per share) | $ / shares	(12.14)
Unvested at the end of the period (in dollars per share) | $ / shares	$ 12.64