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Employee Benefit Plan	3 Months Ended
Employee Benefit Plan	Mar. 31, 2018
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Employee Benefit Plan	14. Employee Benefit Plan The Company maintains a defined-contribution plan under Section 401(k) of the Internal Revenue Code. The 401(k) plan provides retirement benefits for eligible employees. Eligible employees may elect to contribute to the 401(k) plan. The Company provides a match of up to the lesser of 3% of each employee’s annual salary or $6,000, which vests fully over four years of continuous employment. The Company’s matching contribution expense was $0.6 million and $0.6 million during the three months ended March 31, 2018 and 2017, respectively.