Redeemable Convertible Preferred Stock - Preferred Stock and Warrants Calculated Using the Black Scholes Merton Pricing Model (Detail) - $ / shares		12 Months Ended
Mar. 23, 2017	Dec. 31, 2017
Warrants calculated using the Black Scholes Merton pricing model
Number of warrants		325,000
Expiration date	Nov. 13, 2022	May 02, 2020
Warrant
Warrants calculated using the Black Scholes Merton pricing model
Exercise price	$ 2.26	$ 6.62
Expected volatility of underlying stock	72.00%	74.00%
Risk-free interest rate	2.08%	1.62%
Dividend yield	0.00%	0.00%
Expected life of warrants	5 years	8 years
Weighted-average fair value of warrants	$ 0.73	$ 3.11

Financial instruments weighted average fair value per share.

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- Definition

Expiration date of warrants held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column A

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ 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)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Agreed upon price for the exchange of the underlying asset.

+ 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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- 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

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- Definition

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.

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- Definition

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

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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