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Stockholders' Equity - Stock Issuances - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Feb. 28, 2015 | Oct. 31, 2013 | May. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2013 | Oct. 20, 2015 | Dec. 31, 2014 | Apr. 30, 2014 | Mar. 31, 2013 | Dec. 31, 2012
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of units to underwriter | 9,400,000 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) | 9,400,000 | 2,500,000 | 1,300,000 | 1,000,000 |  | 0 |  |  |  |  |
Proceeds of common stock issued, net of related expenses | $ 6,000,000 |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 19.20
Number of warrants outstanding (in shares) |  |  |  |  | 18,059,000 | 929,495 |  | 850,138 |  |  | 352,664
Proceeds from issuance of private placement |  | $ 2,600,000 | $ 7,500,000 | $ 21,500,000 |  |  |  |  |  |  |
Net proceeds from issuance of private placement |  | 2,500,000 | 6,900,000 | $ 21,100,000 |  |  |  |  |  |  |
Securities available subject to market conditions |  |  |  |  | $ 77,400,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |
Proceeds from issuance of common stock | $ 6,000,000 |  |  |  |  |  |  |  |  |  |
ATM Programs [Member] | Cowen and Company, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |
Proceeds of common stock issued, net of related expenses |  |  |  |  | $ 4,700,000 | $ 4,800,000 |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.01 |
Aggregate proceeds from sale of common stock under equity offering program, maximum |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Proceeds from issuance of common stock |  |  |  |  | 4,800,000 | $ 5,000,000 |  |  |  |  |
Aggregate proceeds from sale of common stock under equity offering program, remaining |  |  |  |  | $ 39,900,000 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 7.04 | $ 7.04 |  | $ 7.04 |  |  |
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 |  |  |  |
February 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued |  | $ 800,000 |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 0.74 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 1,100,000 |  |  |  |  |  |
Warrants issued (in shares) |  | 1,100,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 2,600,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of private placement |  | $ 2,500,000 |  |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  | 5 years |  |  |  |  |  |
2013 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued |  |  | $ 1,900,000 |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 7.04 |  |  |  | $ 7.04 |  |
Number of warrants outstanding (in shares) |  |  |  |  | 600,000 |  |  |  |  |  |
Warrants issued (in shares) |  |  | 600,000 |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  | 5 years |  |  |  |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of warrants converted | 7,000,000 |  |  |  |  |  |  |  |  |  |
Gross Proceeds From Underwriting Offering | $ 7,000,000 |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 0.87 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 7,000,000 |  |  |  |  |  |
Series B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of warrants converted | 9,400,000 |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  | $ 0.75 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  | 9,400,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |

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