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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 | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Out of the money options and warrants excluded | 224,491 | 317,443 | 224,491 | 309,922
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 | 136,833 | 137,666 | 136,833 | 137,666
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 | 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 | 75,158 | 75,158
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 |  | 73,765
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 | 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 |  | 833
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

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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