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Stock-Based Compensation - Restricted Stock Units (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Weighted Average Exercise Price Per Share
Unrecognized stock-based compensation expense | $	$ 5.1
Unrecognized compensation expense, weighted-average period expected to be recognized	2 years 6 months
Restricted stock units
Number of Restricted Stock Units
Balance, beginning of period | shares	93,560
Granted | shares	165,152
Vested | shares	(30,492)
Cancelled/forfeited | shares	(9,000)
Balance, end of period | shares	219,220
Weighted Average Exercise Price Per Share
Balance, beginning of period (price per share) | $ / shares	$ 8.38
Granted (price per share) | $ / shares	6.80
Vested (price per share) | $ / shares	8.40
Cancelled/forfeited (price per share) | $ / shares	7.86
Balance, end of period (price per share) | $ / shares	$ 7.21
2016 Employee Incentive Plan | Restricted stock units
Weighted Average Exercise Price Per Share
Unrecognized stock-based compensation expense | $	$ 1.2
Unrecognized compensation expense, weighted-average period expected to be recognized	2 years 6 months

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