The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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Commitments and Contingencies (401(k) Retirement Plan )(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items]
Compensation expense related to 401(k) retirement plan	$ 1.0	$ 0.7	$ 0.6
Up to 2 Percent [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution	2.00%
Company match	100.00%
From 4 to 8 Percent [Member]
Defined Contribution Plan Disclosure [Line Items]
Company match	50.00%
From 4 to 8 Percent [Member] \| Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution	4.00%
From 4 to 8 Percent [Member] \| Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employee contribution	8.00%