Stock-Based Compensation - Summary of Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number of shares
Number of shares, outstanding (in shares) | shares	109,808
Number of shares, exercised (in shares) | shares	(33,057)
Number of shares, outstanding (in shares) | shares	76,751
Number of shares, vested and exercisable (in shares) | shares	76,751
Weighted Average Exercise Price
Weighted average exercise price, outstanding (in $ per share) | $ / shares	$ 16.44
Weighted average exercise price, exercised (in $ per share) | $ / shares	24.74
Weighted average exercise price, outstanding (in $ per share) | $ / shares	12.86
Weighted average exercise price, vested and exercisable (in $ per share) | $ / shares	$ 12.86