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Organization and Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share for Out of Money Potential Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded	225,324	437,443	505,491
Stock Options with an Exercise Price of $3.59 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		7,521
Stock Options With an Exercise Price of $12.48 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded	137,666	137,666	137,667
Stock Options With an Exercise Price of $12.84 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded	4,167	4,167	4,167
Stock Options With an Exercise Price of $26.40 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded	75,158	75,158	79,370
Stock Options With an Exercise Price of $32.76 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded			53,706
Stock Options With an Exercise Price of $34.68 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		73,765	78,707
Stock Options With an Exercise Price of $39.00 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded	8,333	8,333	8,333
Stock Options With an Exercise Price of $41.16 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		833	3,333
Stock Options With an Exercise Price of $42.00 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		8,333	8,333
Stock Options With an Exercise Price of $46.80 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		1,667	1,667
Stock Options With an Exercise Price of $3.52 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded		120,000
Stock Options With an Exercise Price of $43.20 per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Out of the money options and warrants excluded			130,208

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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