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Retirement Plan	12 Months Ended
Retirement Plan	Dec. 31, 2017
Retirement Plan
Retirement Plan	13. Retirement Plan The Company initiated a discretionary Simple IRA Plan offered to all of its employees. Under the Simple IRA Plan, employees may defer income on a tax-exempt basis, subject to limitations under the Internal Revenue Code of 1986, as amended. Under the Simple IRA Plan, the Company may make discretionary matching contributions. Company contributions expensed totaled $0.4 million and $0.1 million during the years ended December 31, 2017 and 2016.