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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | 9. Employee Benefit Plans The Company offers its employees participation in a 401(k) plan, in which the Company matches the employee contributions at a rate of 20%, subject to a vesting schedule. Total employer contributions amounted to $0.2 million in each of the years ended December 31, 2017, 2016, and 2015.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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