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Stockholders' Equity (Deficit) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 03, 2016 | Mar. 16, 2015 | May 31, 2016 | Mar. 31, 2015 | Jun. 30, 2015 | Sep. 30, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  |  | $ 5.87 | $ 8.19
Value of common stock issued in offering |  |  |  |  |  | $ 2,634,000 | $ 8,266,000
Warrant liability |  |  |  |  |  |  | 6,000
Other expenses related to issuance of warrants |  |  |  | $ 213,000 |  |  |
Decrease to additional paid-in capital resulting from warrants issued |  |  |  | $ (3,996,000) |  |  |
June 2016 Offering Liability [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Creation of dilutive financing derivative |  |  |  |  |  | $ 1,816,000 |
Dividend yield | 0.00% |  |  |  |  | 0.00% |
Volatility | 123.00% |  |  |  |  | 123.00% |
Risk-free interest rate | 1.23% |  |  |  |  | 1.10% |
Changes in estimated fair value |  |  |  |  |  | $ (549,000) |
Warrant liability |  |  |  |  |  | 1,267,000 |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Value of common stock issued in offering |  |  |  |  |  | $ 21,000 | $ 16,000
Placement Agent [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of securities called by warrants |  | 94,545 |  |  |  |  |
Exercise price of warrants |  | $ 10.75 |  |  |  |  |
Fees paid to placement agent |  | $ 833,000 |  |  |  |  |
Other expenses related to issuance of warrants |  |  |  |  | $ 218,000 |  |
Private Placement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction |  | 1,575,758 |  |  |  |  |
Sale of stock, price per share |  | $ 8.25 |  |  |  |  |
Number of securities called by warrants |  | 393,939 |  |  |  |  |
Exercise price of warrants |  | $ 10.75 |  |  |  |  |
Proceeds from Issuance of Private Placement |  | $ 13,000,000 |  |  |  |  |
Warrant liability |  | $ 4,210,000 |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction |  |  | 2,127,660 |  |  |  |
Sale of stock, price per share |  |  | $ 2.35 |  |  |  |
Proceeds from issuance of common stock and warrants | $ 5,000,000 |  |  |  |  |  |
Number of securities called by warrants |  |  | 1,063,830 |  |  |  |
Number of shares called by each warrant |  |  | 0.50 |  |  |  |
Exercise price of warrants |  |  | $ 2.25 |  |  |  |
Warrant expiration term |  |  | 5 years |  |  |  |
Proceeds from issuance of stock and warrants, net of offering costs |  |  | $ 4,200,000 |  |  |  |
Placement agent fee as percentage of total gross proceeds of offering |  |  | 7.00% |  |  |  |
Fees paid to placement agent |  |  | $ 75,000 |  |  |  |
Value of common stock issued in offering |  |  | 3,200,000 |  |  |  |
Stock issuance costs |  |  | 800,000 |  |  |  |
Issuance costs allocable to warrants |  |  | $ 200,000 |  |  |  |

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