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Convertible Notes Payable - Summary of Convertible Notes Outstanding (Detail) - Senior Secured Convertible Notes [Member] - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 13, 2016
Debt Instrument [Line Items]
Convertible notes payable, principal	$ 11,437,000	$ 34,351,000	$ 35,000,000	$ 35,000,000
Debt discounts	(1,701,000)	(21,008,000)
Net convertible note payable	$ 9,736,000	$ 13,343,000

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Shares issued and outstanding.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(13))
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Face (par) amount of debt instrument at time of issuance.

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-Topic 835
-SubTopic 30
-Section 55
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Amount, after accumulated amortization, of debt discount.

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