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v3.3.1.900

Equity Transactions - Additional Information (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 21, 2014 | Mar. 20, 2014 | Mar. 20, 2014 | Mar. 17, 2014 | Dec. 31, 2011 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  | $ 6,980,000 | $ (33,000) | $ (1,662,000)
Common stock warrant liabilities |  |  |  |  |  | $ 687,000 | $ 687,000 | 8,702,000 |
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  | 1.30% |  |  |
Dividend yield |  |  |  |  |  | 0.00% |  |  |
Expected volatility |  |  |  |  |  | 70.00% |  |  |
Expected life |  |  |  |  |  | 4 years 3 months |  |  |
Deerfield [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares to be called by warrants |  |  |  |  |  | 11,450,000 | 11,450,000 |  |
Exercise price of warrants | $ 1.39 | $ 1.39 | $ 1.39 | $ 1.39 |  |  |  |  |
Number of days following borrowing request to determine exercise price associated with each disbursement borrowing under facility agreement |  |  |  | 15 days |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 50,000,000 |  | $ 26,000,000 | $ 26,000,000 | $ 26,000,000 |
Warrants value | $ 900,000 | $ 4,700,000 | $ 4,700,000 | $ 5,700,000 |  |  |  |  |
Amount of draw down under Facility Agreement | 6,000,000 | 20,000,000 | 20,000,000 |  |  | $ 26,000,000 | 26,000,000 |  |
Net proceeds from initial draw under Facility Agreement |  | 19,500,000 | 19,500,000 |  |  |  |  |  |
Net proceeds from draw under Facility Agreement | 5,900,000 |  |  |  |  |  |  |  |
Warrant amount reclassified as debt discount | $ 200,000 | $ 2,300,000 | $ 2,300,000 |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  | $ 8,000,000 |  |
SiliconValley Bank (SVB) [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares to be called by warrants |  |  |  |  | 93,750 |  |  |  |
Exercise price of warrants |  |  |  |  | $ 1.60 |  |  |  |
Amendment fee amount waived |  |  |  |  | $ 200,000 |  |  |  |
Warrant term |  |  |  |  | 10 years |  |  |  |
Maximum [Member] | Deerfield [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of shares to purchase under warrants |  |  |  | 10,000,000 |  |  |  |  |
Warrants Issued on March 17, 2014 [Member] | Deerfield [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares to be called by warrants |  |  |  | 6,250,000 |  |  |  |  |
Warrants issued on March 20, 2014 [Member] | Deerfield [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares to be called by warrants |  | 4,000,000 | 4,000,000 |  |  |  |  |  |
Warrants Issued on November 21, 2014 [Member] | Deerfield [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares to be called by warrants | 1,200,000 |  |  |  |  |  |  |  |

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