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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2017
Defined Contribution Plan
Defined Contribution Plan	14. Defined Contribution Plan The Company has a 401(k) defined contribution plan (the "401(k) Plan") for substantially all of its employees. Eligible employees may make pretax contributions to the 401(k) Plan up to statutory limits. The Company makes matching employee contributions in cash to the 401(k) Plan at a rate of 100% of the first 3% of earnings contributed and 50% of the next 2% of earnings contributed. Employees participating in the 401(k) Plan are fully vested in the Company matching contributions, and investments are directed by participants. The Company made matching contributions of $137 and $131 for the years ended December 31, 2017 and 2016, respectively.