Income Taxes - Reconciliation of U.S. Statutory Rate and Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S. federal tax rate (in percentage)	35.00%	35.00%	35.00%
State income taxes, net of federal benefit (in percentage)	5.34%	(0.90%)	6.13%
Taxable gain resulting from 2015 IP Assignment (in percentage)	0.00%	(75.31%)	0.00%
Non-taxable foreign loss (in percentage)	(2.69%)	(6.98%)	0.00%
Tax deferral from 2015 IP Assignment (in percentage)	(0.19%)	3.56%	0.00%
Other (in percentage)	(1.45%)	0.02%	(0.04%)
Valuation allowance (in percentage)	(36.20%)	44.42%	(41.09%)
Effective tax rate (in percentage)	(0.19%)	(0.19%)	0.00%

Effective Income Tax Rate Reconciliation, Tax Deferral From Organizational Transaction

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Effective Income Tax Rate Reconciliation, Taxable Gain From Organizational Transaction

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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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
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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