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Assets and Liabilities Measured at Fair Value - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) shares | Feb. 28, 2015 USD ($) shares | Oct. 31, 2013 USD ($) shares | May. 31, 2012 USD ($) shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) shares | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) Input $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Apr. 30, 2014 $ / shares | Dec. 31, 2012 $ / shares shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of inputs used for valuation of warrants | Input |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Sale of units to underwriter | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold through the program (in shares) | 9,400,000 | 2,500,000 | 1,300,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  | 0 |  |
Proceeds From Issuance Of Common Stock | $ | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of Warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.20
Warrant outstanding |  |  |  |  | 18,059,000 |  |  |  | 850,138 |  |  |  | 18,059,000 | 850,138 | 929,495 |  | 352,664
Proceeds from issuance of private placement | $ |  | $ 2,600 | $ 7,500 | $ 21,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of private placement | $ |  | 2,500 | 6,900 | 21,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative warrant liability [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of the warrant liability, net | $ |  |  |  |  | $ 850 | $ (1,253) | $ 48 | $ (209) | $ (330) | $ (519) | $ (1,297) | $ 205 | $ 564 | $ 1,942 | $ 2,756 |  |
Derivative warrant liabilities | $ |  |  |  |  | $ 3,785 |  |  |  | $ 225 |  |  |  | $ 3,785 | $ 225 |  |  |
February 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  | $ 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of Warrants (in dollars per share) | $ / shares |  |  |  |  | $ 0.74 |  |  |  |  |  |  |  | $ 0.74 |  |  |  |
Warrant outstanding |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  | 1,100,000 |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Warrants issued (in shares) |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  | $ 2,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of private placement | $ |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
2013 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  | $ 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of Warrants (in dollars per share) | $ / shares |  |  |  |  | $ 7.04 |  |  |  |  |  |  |  | $ 7.04 |  |  | $ 7.04 |
Warrant outstanding |  |  |  |  | 600,000 |  |  |  |  |  |  |  | 600,000 |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Warrants issued (in shares) |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
2012 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  | $ 3,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2015 |  |  |  |
Warrants issued (in shares) |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term period for warrants |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Net proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants converted | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds From Underwriting Offering | $ | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of Warrants (in dollars per share) | $ / shares |  |  |  |  | $ 0.87 |  |  |  |  |  |  |  | $ 0.87 |  |  |  |
Warrant outstanding |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  | 7,000,000 |  |  |  |
Warrants expiry period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Series B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants converted | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of Warrants (in dollars per share) | $ / shares |  |  |  |  | $ 0.75 |  |  |  |  |  |  |  | $ 0.75 |  |  |  |
Warrant outstanding |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  | 9,400,000 |  |  |  |
Warrants expiration date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 29, 2016 |  |  |  |
Series A and B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ | $ 3,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |

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