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Stock-Based Compensation (Policies)	3 Months Ended
	Mar. 31, 2018
Share-based Compensation [Abstract]
Compensation-Stock Based Compensation	The Company recognizes stock-based compensation in accordance with the provisions of ASC Topic 718, Compensation--Stock Compensation. Stock-based compensation expense, excluding compensation charges related to our employee stock purchase plan, or the ESPP, was $843 and $943 for the three months ended March 31, 2018 and 2017, respectively. As of March 31, 2018, there was $1,586 of total unrecognized compensation expense related to stock options, which is expected to be recognized over a weighted-average period of 2.83 years. As of March 31, 2018, there was $3,379 of total unrecognized compensation expense related to restricted stock awards, which is expected to be recognized over a weighted-average period of 2.30 years.

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- References

No definition available.

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- Definition

Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b),(f)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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