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Stockholders' Equity - Stock Option Activity (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Options, Number of Options [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 47,221 | 17,577 |
Granted (in shares) |  | 32,765 |
Forfeited (in shares) | (5,865) | (3,121) |
Outstanding, end of period (in shares) | 41,356 | 47,221 | 17,577
Exercisable (in shares) | 26,774 |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |
Granted (in dollars per share) |  | $ 19.04 |
Stock Options, Weighted Average Exercise Price [Roll Forward] |  |  |
Outstanding, beginning of period (in dollars per share) | $ 122.40 | 378.08 |
Granted (in dollars per share) |  | 19.04 |
Forfeited (in dollars per share) | 23.95 | 480.16 |
Outstanding, beginning of period (in dollars per share) | 135.77 | $ 122.40 | $ 378.08
Exercisable (in dollars per share) | $ 199.31 |  |
Stock Options, Weighted Average Remaining Life Years [Abstract] |  |  |
Outstanding | 7 years 10 months 24 days | 8 years 11 months 12 days | 8 years 9 months 29 days
Exercisable | 7 years 7 months 17 days |  |
Minimum [Member] |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |
Outstanding, beginning of period (in dollars per share) | $ 19.04 | $ 19.84 |
Forfeited (in dollars per share) | 19.04 | 19.04 |
Outstanding, end of period (in dollars per share) | 19.84 | 19.04 | $ 19.84
Exercisable (in dollars per share) | 19.04 |  |
Maximum [Member] |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |
Outstanding, beginning of period (in dollars per share) | 3,921.92 | 3,921.92 |
Forfeited (in dollars per share) | 545.28 | 2,713.60 |
Outstanding, end of period (in dollars per share) | 3,788.80 | $ 3,921.92 | $ 3,921.92
Exercisable (in dollars per share) | $ 3,788.80 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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