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401(k) Savings and Retirement Plan	12 Months Ended
401(k) Savings and Retirement Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
401(k) Savings and Retirement Plan	401(k) Savings and Retirement Plan The Company has two defined contribution savings plans established under Section 401(k) of the Internal Revenue Code. These plans cover substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pretax basis, subject to legal limitations. Total contributions were $0.1 million in 2017, and there were no contributions in 2016. Our common stock is not an investment option to employees participating in the 401(k) Savings and Retirement Plan.