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Retirement Savings Plan	12 Months Ended
Retirement Savings Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Savings Plan	Retirement Savings Plan The Company has a defined contribution 401(k) retirement savings plan (the “Plan”). Substantially all of the Company’s U.S. employees are eligible to participate in the Plan after meeting certain minimum age and service requirements. The Company suspended the employer matching program on August 1, 2014. Effective January 1, 2016, the Company reinstated the employer matching program and matches 50% of the first 6% of an employee’s designated deferral of their eligible compensation. Employees may make discretionary contributions to the Plan subject to Internal Revenue Service limitations. Employer matching contributions under the Plan amounted to approximately $0.5 million and $0.6 million for the years ended December 31, 2017 and 2016, respectively. Employer matching contributions vested over a two-year period prior to January 1, 2016 and vest immediately beginning January 1, 2016.