Income Taxes - Difference in Effective Tax Rate and Federal Statutory Rate (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax expense (benefit) at statutory rate	(35.00%)	(35.00%)	(35.00%)
Non-deductible expenses and other	(74.80%)	1.10%	3.80%
Valuation allowance	15.40%	(1.10%)	30.80%
Change in federal statutory tax rate	60.40%	(0.00%)	(0.00%)
Effective tax rate	(34.00%)	(35.00%)	(0.40%)

Effective Income Tax Rate Reconciliation, Nondeductible Expense And Other

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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