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Employee 401 (k) Plan	12 Months Ended
Employee 401 (k) Plan	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee 401 (k) Plan	Employee 401 (k) Plan Basic has a 401(k) profit sharing plan that covers substantially all employees. Employees may contribute up to their base salary not to exceed the annual Federal maximum allowed for such plans. At management’s discretion, Basic may make a matching contribution proportional to each employee’s contribution. Employee contributions are fully vested at all times. Employer matching contributions vest incrementally, with full vesting occurring after five years of service. Employer contributions to the 401(k) plan approximated, $0.4 million in 2015, and have been suspended since 2016.