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Stock-Based Compensation - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Issued (in shares)	(37,500)	(77,500)
Aggregate Intrinsic Value
Vested (in shares)	37,500	77,500
Restricted Stock Units
Restricted Stock Units
Vesting period	5 years
Restricted Stock Units
Restricted stock units at the beginning of the period (in shares)	37,000	120,000
Issued (in shares)	(37,000)	(78,000)
Forfeited (in shares)		(5,000)
Restricted stock units at the end of the period (in shares)	0	37,000	120,000
Weighted-Average Grant Date Fair Value
Restricted stock units at the beginning of the period (in dollars per share)	$ 5.23	$ 3.97
Issued (in dollars per share)	5.23	3.05
Forfeited (in dollars per share)		8.81
Restricted stock units at the end of the period (in dollars per share)	$ 0.00	$ 5.23	$ 3.97
Weighted Average Remaining Contractual Life
Restricted stock units	0 years	4 months 17 days	8 months 12 days
Aggregate Intrinsic Value
Restricted stock units		$ 178	$ 252
Stock price	$ 9.00	$ 4.75	$ 2.10
Vested (in shares)	37,000	78,000
Restricted Stock Units | Fourth anniversary of the grant date
Restricted Stock Units
Vesting (as a percent)	50.00%
Restricted Stock Units | Fifth anniversary of the grant date
Restricted Stock Units
Vesting (as a percent)	50.00%

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