Stock-Based Compensation - Summary and Changes of Non-Vested Restricted Stock (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of RSUs
Non-vested balance at beginning of period (in shares) | shares	175,591
Shares granted (in shares) | shares	0
Shares vested (in shares) | shares	(71,206)
Shares forfeited (in shares) | shares	(3,612)
Non-vested balance at end of period (in shares) | shares	100,773
Weighted Average Exercise Price
Weighted average exercise price, non-vested balance beginning (in dollars per share) | $ / shares	$ 4.78
Shares granted - weighted average exercise price (in dollars per share) | $ / shares	0
Shares vested - weighted average exercise price (in dollars per share) | $ / shares	5.20
Shares forfeited - weighted average exercise price (in dollars per share) | $ / shares	3.53
Weighted average exercise price, non-vested balance ending (in dollars per share) | $ / shares	$ 4.53