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Salary Deferral Plan	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Salary Deferral Plan	12. Salary Deferral Plan The Company maintains a salary deferral plan (the “Plan”) in accordance with Internal Revenue Code Section 401(k), as amended. The Plan provides for matching contributions, of which $374,000 and $465,000 were made in 2017 and 2016, respectively.

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- References

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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

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