Share-based Payments - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, outstanding at beginning of period (in shares)	843,446	544,647
Number of shares, granted (in shares)	50,000	337,500
Number of shares, expired and canceled (in shares)	(34,875)	(38,701)
Number of shares, forfeited prior to vesting (in shares)	(27,500)
Number of shares, exercised (in shares)
Number of shares, outstanding at end of period (in shares)	831,071	843,446
Number of shares, vested and expected to vest at end of period (in shares)	831,071	843,446
Number of shares, vested at end of period (in shares)	555,237	505,946
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning of period (in dollars per share)	$ 6.6	$ 9.01
Weighted average exercise price, granted (in dollars per share)	2.3	2.5
Weighted average exercise price, expired and canceled (in dollars per share)	6.7	4.81
Weighted average exercise price, forfeited prior to vesting (in dollars per share)	2.5
Weighted average exercise price, exercised (in dollars per share)
Weighted average exercise price, end of period (in dollars per share)	6.47	6.6
Weighted average exercise price, vested and expected to vest at end of period (in dollars per share)	6.47	6.6
Weighted average exercise price, vested at end of period (in dollars per share)	$ 8.46	$ 9.33
Weighted Average Remaining Contractual Term (Years)	4 years 1 month 6 days	4 years 10 months 28 days	4 years 11 months 4 days
Weighted average remaining contractual term, vested and expected to vest (Years)	4 years 1 month 6 days	4 years 10 months 28 days
Weighted average remaining contractual term, vested (Years)	3 years 7 months 20 days	4 years 2 months 15 days
Aggregate intrinsic value
Aggregate intrinsic value, vested and expected to vest
Aggregate intrinsic value, vested