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Convertible Notes Payable - Summary of Common Stock and Preferred Stock Shares Issued under Notes and New Notes (Detail) - USD ($)																6 Months Ended		12 Months Ended
	Dec. 28, 2017	Nov. 15, 2017	Nov. 06, 2017	Aug. 28, 2017	Aug. 04, 2017	Jul. 07, 2017	Jul. 02, 2017	Jun. 07, 2017	May 09, 2017	Apr. 10, 2017	Mar. 13, 2017	Mar. 02, 2017	Feb. 10, 2017	Feb. 01, 2017	Jan. 12, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 28, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Applicable Conversion Price					$ 5,250.00	$ 12,250.00			$ 8,750.00	$ 10,500.00	$ 19,250.00	$ 24,500.00	$ 35,000.00	$ 56,000.00	$ 63,000.00
Reduction in Principal					$ 1,015,848	$ 2,000,000			$ 1,913,915	$ 3,621,286	$ 4,417,829	$ 125,999	$ 3,045,817	$ 544,000	$ 1,478,318	$ 0	$ 15,831,000	$ 40,121,000	$ 35,000,000	$ 649,000	$ 0
Exchange Agreement [Member]
Debt Instrument [Line Items]
Number of Shares	247,417
Applicable Conversion Price	$ 10.00	$ 41.72					$ 12,250.00	$ 12,250.00											$ 10.00
Reduction in Principal	$ 2,474,174	$ 8,130,564					$ 4,200,000	$ 4,200,000
Restructuring Agreement [Member]
Debt Instrument [Line Items]
Applicable Conversion Price				$ 5,250.00
Reduction in Principal				$ 1,200,000
Warrant Exchange [Member]
Debt Instrument [Line Items]
Reduction in Principal			$ 279,016
Retirement Exchange Agreement [Member]
Debt Instrument [Line Items]
Reduction in Principal	$ 553,234
Common Stock Issued [Member]
Debt Instrument [Line Items]
Number of Shares					83	229			218	344	229	5	87	10	23				642,885
Common Stock Issued [Member] | Exchange Agreement [Member]
Debt Instrument [Line Items]
Number of Shares	445,152	194,896					1,380	1,380
Common Stock Issued [Member] | Restructuring Agreement [Member]
Debt Instrument [Line Items]
Number of Shares				229
Preferred Stock Issued [Member] | Exchange Agreement [Member]
Debt Instrument [Line Items]
Number of Shares							4,200	4,200

X

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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