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Warrants (Warrants Classified as Equity) (Detail) - $ / shares			12 Months Ended
	Jul. 29, 2016	May 08, 2013	Dec. 31, 2016	Jun. 30, 2017	Jul. 13, 2016	May 10, 2016	Jan. 12, 2016	Dec. 31, 2015
Warrants and Rights Note Disclosure [Abstract]
Duration of average market price used for warrant exercise price		20 days
Exercise price (usd per share)	$ 8.60	$ 49.4	$ 79.40	$ 79.40	$ 13.00	$ 30.20	$ 28.40	$ 79.40
Warrants outstanding	50,000	9,109	100,000	15,000		50,000
Fair value assumptions, expected volatility rate	106.63%	75.34%	77.13%
Fair value assumptions, expected term (in years)	5 years 6 months	7 years	5 years 6 months
Fair value assumptions, risk free interest rate	1.35%	1.20%	1.26%
Fair value assumptions, expected dividend rate	0.00%	0.00%	0.00%
Fair value of warrants granted (usd per share)		$ 38.60
Warrant term		7 years	5 years

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Class of Warrant or Right, Term

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Class of warrant or right, number of days averaged for exercise price.

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Fair Value of Warrants Granted, per Share

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Warrants Granted, Number of Shares

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

+ References

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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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Period the instrument, asset or liability is expected to be outstanding, 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 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
-Subparagraph (bbb)
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Risk-free interest rate assumption used in valuing an instrument.

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