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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	J. Employee Benefit Plans The Company offers a defined contribution plan for eligible employees, in which the Company makes discretionary contributions up to 50% of the first 6% of eligible compensation contributed by participants. The Company contributed approximately $116,000 and $107,000 in discretionary contributions during 2017 and 2016, respectively. Participants vest in employer contributions starting after their second year of service at 20% increments, vesting 100% in year six.