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Stockholders' Equity - Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Options, Number of Options [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 88 | 136 | 51 |
Granted (in shares) | 42 |  | 94 |
Forfeited (in shares) | (3) | (48) | (9) |
Outstanding, end of period (in shares) | 127 | 88 | 136 | 51
Exercisable (in shares) | 75 |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |
Granted (in dollars per share) | $ 84.00 |  | $ 6,664 |
Forfeited (in dollars per share) | 6,664.00 |  |  |
Stock Options, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | 12,815.73 | $ 42,840.00 | 132,328.00 |
Granted (in dollars per share) | 84.00 |  | 6,664.00 |
Forfeited (in dollars per share) | 6,664.00 | 8,382.50 | 168,056.00 |
Outstanding, beginning of period (in dollars per share) | 8,750.55 | $ 12,815.73 | $ 42,840.00 | $ 132,328.00
Exercisable (in dollars per share) | $ 13,882.03 |  |  |
Stock Options, Weighted Average Remaining Life Years [Abstract] |  |  |  |
Outstanding | 7 years 9 months 14 days | 7 years 10 months 24 days | 8 years 11 months 12 days | 8 years 9 months 29 days
Exercisable | 7 years 1 month 6 days |  |  |
Minimum [Member] |  |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 6,644 | $ 6,664 | $ 6,944 |
Forfeited (in dollars per share) |  | 6,664 | 6,664 |
Outstanding, end of period (in dollars per share) | 84.00 | 6,644 | 6,664 | $ 6,944
Exercisable (in dollars per share) | 6,664.00 |  |  |
Maximum [Member] |  |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | 1,326,080 | 1,372,672 | 1,372,672 |
Forfeited (in dollars per share) |  | 190,848 | 949,760 |
Outstanding, end of period (in dollars per share) | 381,696.00 | $ 1,326,080 | $ 1,372,672 | $ 1,372,672
Exercisable (in dollars per share) | $ 381,696.00 |  |  |

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