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Stockholders' Equity - Stock and Warrant Issuances - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Jul. 31, 2015 | Feb. 28, 2015 | Oct. 31, 2013 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 13, 2016 | Dec. 31, 2015 | Oct. 20, 2015 | Dec. 31, 2014
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) | 425,000 | 600,000 | 153,750 | 81,875 |  |  |  |  |  |
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 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 7,216,020 |  |  | 1,128,688 |  | 53,134
Sale of units to underwriter |  | 600,000 |  |  |  |  |  |  |  |
Proceeds of common stock issued, net of related expenses |  | $ 6,000,000 |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 112.64 |  |  | $ 112.64 |  | $ 112.64
Maximum offering and selling of stock and securities that entity make to raise capital |  |  |  |  |  |  |  |  | $ 77,400,000 |
Entity public float pursuant to SEC regulations |  |  |  |  |  |  |  |  | $ 75,000,000 |
Senior Secured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  | $ 34,351,000 |  | $ 35,000,000 |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 1.61 |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 300,000 |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 300,000 |  |  |  |  |
Net proceeds from exercise of warrants |  |  |  |  | $ 400,000 |  |  |  |  |
Number of warrants converted |  | 400,000 |  |  |  |  |  | 100,000 |  |
Gross proceeds from underwriting offering |  | $ 7,000,000 |  |  |  |  |  |  |  |
Warrants expiry period |  |  |  |  | 5 years |  |  |  |  |
Series B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 100,000 |  |  |  |  |
Net proceeds from exercise of warrants |  |  |  |  | $ 800,000 |  |  |  |  |
Number of warrants converted |  | 600,000 |  |  |  |  |  |  |  |
Remaining outstanding warrants expired |  |  |  |  | 400,000 |  |  |  |  |
Warrants expiration date |  |  |  |  | Jan. 29, 2016 |  |  |  |  |
Series A and B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Value of warrants issued |  | $ 3,400,000 |  |  |  |  |  |  |  |
2013 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  | 37,000 |  |  |  |  |  |
Value of warrants issued |  |  |  | $ 1,900,000 |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 112.64 |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 36,848 |  |  |  |  |
Term period for warrants |  |  |  |  | 5 years |  |  |  |  |
February 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  | 69,000 |  |  |  |  |  |  |
Value of warrants issued |  |  | $ 800,000 |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 1.61 |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 30,238 |  |  |  |  |
Term period for warrants |  |  |  |  | 5 years |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 40,000 |  |  |  |  |
Net proceeds from exercise of warrants |  |  |  |  | $ 100,000 |  |  |  |  |
Series C Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Value of warrants issued |  |  |  |  |  | $ 27,800,000 |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 4.83 |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 6,800,000 |  |  |  |  |
Percentage of increased number of warrant shares issuable upon exercise |  |  |  |  | 75.00% |  |  |  |  |
Description of warrant issued upon exercise |  |  |  |  | On December 31, 2017, the number of Warrant Shares issuable upon exercise of the Series C Warrants will be increased by such number of Warrant Shares equal to 75% of the difference of (i) the quotient of (A) the product of (x) the exercise price as of the date of issuance (as adjusted for certain events) multiplied by (y) the number of Warrant Shares as of the date of issuance (as adjusted for certain events), divided by (B) the volume-weighted average price of the Common Stock on the maturity date, less (ii) the number of Warrant Shares as of the date of issuance (as adjusted for certain events). |  |  |  |  |
Warrants holding period |  |  |  |  | 1 year |  |  |  |  |
Warrants exercisable period |  |  |  |  | 5 years |  |  |  |  |
Series C Warrants [Member] | Senior Secured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Number of warrants converted |  |  |  |  |  | 6,800,000 |  |  |  |
Debt instrument, principal face amount |  |  |  |  |  | $ 35,000,000 |  |  |  |
October 2016 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | 148,750 |  |  |  |  |  |  |  |  |
Value of warrants issued | $ 300,000 |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 1.61 |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 78,750 |  |  |  |  |
Term period for warrants |  |  |  |  | 5 years |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 70,000 |  |  |  |  |
Net proceeds from exercise of warrants |  |  |  |  | $ 100,000 |  |  |  |  |

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