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Stockholders' Equity - Warrants - Additional Information (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jul. 31, 2015 | Feb. 28, 2015 | Oct. 31, 2013 | Sep. 30, 2017
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Sale of common stock, net of expenses (in shares) | 1,215 | 1,715 | 440 | 234 |
Proceeds from issuance of private placement | $ 1,200,000 |  | $ 2,600,000 | $ 7,500,000 |
Net proceeds from issuance of private placement | $ 1,100,000 |  | $ 2,500,000 | $ 6,900,000 |
Sale of units to underwriter |  | 1,715 |  |  |
Proceeds of common stock issued, net of related expenses |  | $ 6,000,000 |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 49.00
Number of warrants outstanding (in shares) |  |  |  |  | 500
Number of warrants converted |  | 1,140 |  |  | 285
Gross proceeds from underwriting offering |  | $ 7,000,000 |  |  |
Warrants expiry period |  |  |  |  | 5 years
Warrants exercised (in shares) |  |  |  |  | 285
Net proceeds from exercise of warrants |  |  |  |  | $ 15,000
Series B Common Stock Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Number of warrants converted |  | 1,715 |  |  |
Warrants exercised (in shares) |  |  |  |  | 285
Net proceeds from exercise of warrants |  |  |  |  | $ 800,000
Remaining outstanding warrants expired |  |  |  |  | 1,140
Warrants expiration date |  |  |  |  | Jan. 29, 2016
Series A and B Common Stock Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Value of warrants issued |  | $ 3,400,000 |  |  |
2013 Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Warrants issued (in shares) |  |  |  | 106 |
Value of warrants issued |  |  |  | $ 1,900,000 |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 39,424.00
Number of warrants outstanding (in shares) |  |  |  |  | 100
Term period for warrants |  |  |  |  | 5 years
February 2015 Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Warrants issued (in shares) |  |  | 197 |  |
Value of warrants issued |  |  | $ 800,000 |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 49.00
Number of warrants outstanding (in shares) |  |  |  |  | 100
Term period for warrants |  |  |  |  | 5 years
October 2016 Warrants [Member] |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Warrants issued (in shares) | 425 |  |  |  |
Value of warrants issued | $ 300,000 |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 49.00
Number of warrants outstanding (in shares) |  |  |  |  | 200
Term period for warrants |  |  |  |  | 5 years

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