Stockholders' Equity Sale of Common Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended
Jan. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share)	$ 5.599
Number of securities called by warrants or rights \| shares	7,258,263
Exercise price of warrants (in dollars per share)	$ 0.001
Sale of stock, consideration received on transaction \| $	$ 66.8
Warrants and rights outstanding \| $	$ 40.6
Risk free interest rate	2.04%
Weighted average volatility rate	98.60%
Expected term	6 years 1 month 6 days
Expected dividend rate	0.00%
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues \| shares	5,002,702
Share price (in dollars per share)	$ 5.60
Sale of stock, percentage of ownership after transaction	19.99%

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
-Name Accounting Standards Codification
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Price of a single share of a number of saleable stocks of a company.

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Number of new stock issued during the period.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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