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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  | 1 Months Ended | 12 Months Ended
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Jun. 21, 2016 $ / shares shares | Apr. 28, 2015 $ / shares shares | May 07, 2014 $ / shares shares | Apr. 30, 2015 | Aug. 31, 2013 USD ($) | Dec. 31, 2016 USD ($) segment shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Shelf registration (years) |  |  |  | 3 years |  |  |  |
Deferred offering costs | $ |  |  |  |  |  | $ 345,000 | $ 417,000 |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock sold (in shares) | shares |  | 5,376,622 | 6,200,000 |  |  | 10,696,456 | 5,376,622 |
Number of warrants issued to purchase common stock (in shares) | shares |  |  |  |  |  | 14,033 | 14,033 |
Public offering price (in dollars per share) | $ / shares |  | $ 7.70 | $ 10.00 |  |  |  |  |
Upfront payment received | $ |  |  |  |  | $ 1,500,000 |  |  |
Deferred revenue recognition period (in months) |  |  |  |  | 70 months |  |  |
Revenue recognized from upfront payments | $ |  |  |  |  |  | $ 257,000 | $ 257,000 | $ 256,000
Revenue from asset purchase agreement | $ |  |  |  |  |  | $ 0 |  |
Operating segments (number) | segment |  |  |  |  |  | 1 |  |
June 2016 Public Offering |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock sold (in shares) | shares | 9,375,000 |  |  |  |  |  |  |
Number of warrants issued to purchase common stock (in shares) | shares | 4,218,750 |  |  |  |  |  |  |
Public offering price (in dollars per share) | $ / shares | $ 2.40 |  |  |  |  |  |  |

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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d),(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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