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Stockholders' Equity - Summary of Warrant Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Warrants outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 78 | 44 | 9 |
Issued (in shares) | 14,256 | 30 | 35 |
Exercised (in shares) | (246) | (3) |  |
Expired (in shares) | (39) | (3) |  |
Outstanding, end of period (in shares) | 14,049 | 78 | 44 | 9
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 910,000 | $ 44,858,633 | $ 15,170,879 |
Issued (in dollars per share) | 2,299 | 840,000 | 2,240,000 |
Exercised (in dollars per share) | 4,221 | 481,250 | 2,296,000 |
Expired (in dollars per share) | 845,250 | 994,000 | 2,296,000 |
Outstanding, end of period (in dollars per share) | $ 1,569 | $ 910,000 | $ 44,858,633 | $ 15,170,879
Weighted average remaining life | 4 years 10 months 17 days | 5 years 7 months 2 days | 2 years 1 month 28 days | 2 years 9 months 11 days
Minimum [Member] |  |  |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 1,225 | $ 281,750 | $ 2,072,000 | $ 4,900,000
Maximum [Member] |  |  |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 19,712,000 | $ 19,712,000 | $ 19,712,000 | $ 19,712,000

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