Stock-Based Compensation - Outstanding Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, shares | shares	291,779
Outstanding (in dollars per share) | $ / shares	$ 14.05
Outstanding, remaining term	4 years 2 months 12 days
Outstanding, intrinsic value | $	$ 0
Vested and expected to vest, shares | shares	290,892
Vested and expected to vest (in dollars per share) | $ / shares	$ 14.07
Vested and expected to vest, remaining term	4 years 2 months 12 days
Vested and expected to vest, intrinsic value | $	$ 0
Exercisable, shares | shares	277,299
Exercisable (in dollars per share) | $ / shares	$ 14.38
Exercisable, remaining term	4 years
Exercisable, intrinsic value | $	$ 0
Zero to Ten Dollars
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, shares | shares	181,188
Outstanding (in dollars per share) | $ / shares	$ 7.64
Outstanding, remaining term	5 years 3 months 18 days
Ten Dollars to Twenty Dollars
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, shares | shares	14,634
Outstanding (in dollars per share) | $ / shares	$ 16.28
Outstanding, remaining term	2 years 10 months 24 days
Twenty Dollars to Thirty Dollars
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, shares | shares	95,957
Outstanding (in dollars per share) | $ / shares	$ 25.83
Outstanding, remaining term	2 years 3 months 18 days