Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 2) - Stock Option [Member] - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Minimum [Member]
Exercise price	$ 1.42	$ 4.18
Expected stock price volatility	122.40%	117.20%
Risk-free rate of interest	0.96%	0.74%
Term (years)	4 years 4 months 2 days	1 year 10 months 24 days
Maximum [Member]
Exercise price	$ 1.98	$ 32.87
Expected stock price volatility	141.30%	130.40%
Risk-free rate of interest	1.15%	1.08%
Term (years)	9 years 7 months 24 days	3 years

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

No definition available.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

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

+ References

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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