Stock-based Compensation - Restricted Stock and Restricted Stock Units Activity (Details) - Restricted stock and restricted stock units	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Number of Shares
Unvested beginning balance (in shares) | shares	849,571
Granted (in shares) | shares	293,250
Vested (in shares) | shares	(139,325)
Canceled/Forfeited (in shares) | shares	(7,500)
Unvested and expected to vest ending balance (in shares) | shares	995,996
Weighted Average Grant Date Fair Value
Unvested beginning balance (in dollars per share) | $ / shares	$ 15.12
Granted (in dollars per share) | $ / shares	61.78
Vested (in dollars per share) | $ / shares	17.68
Canceled/Forfeited (in dollars per share) | $ / shares	19.77
Unvested and expected to vest ending balance (in dollars per share) | $ / shares	$ 28.47