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Stockholders' Equity (Deficit) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 16, 2015 | Mar. 31, 2015 | Dec. 31, 2013 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, price per share |  |  |  |  | $ 3.98 |
Warrant liability |  |  |  |  | $ 6,000 | $ 5,826,000
Placement Agent [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Fees paid to placement agent | $ 833,000 |  |  |  |  |
Warrant liability | $ 814,000 |  |  |  |  |
Other expenses related to issuance of warrants |  |  |  | $ 213,000 | 218,000 |
Series March 2015 Warrants [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of securities called by warrants | 393,939 |  |  |  |  |
Exercise price of warrants | $ 10.75 |  |  |  |  |
Decrease to additional paid-in capital resulting from warrants issued |  |  |  |  | $ 3,996,000 |
Private Placement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction | 1,575,758 |  | 1,440,140 |  |  |
Sale of stock, price per share | $ 8.25 |  | $ 12.50 |  |  |
Proceeds from issuance of private placement, gross | $ 13,000,000 | $ 13,000,000 |  |  |  |
Warrant liability | 4,210,000 |  |  |  |  |
Other expenses related to issuance of warrants | $ 213,000 |  |  |  |  |
Private Placement [Member] | Placement Agent [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of securities called by warrants | 94,545 |  |  |  |  |
Exercise price of warrants | $ 10.75 |  |  |  |  |
Private Placement [Member] | Series March 2015 Warrants [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Exercise price of warrants | $ 10.75 |  |  |  |  |
Warrant liability | $ 3,396,000 |  |  |  |  |

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