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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Narrative) (Details) - USD ($) |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 08, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Jun. 20, 2016 | Dec. 31, 2015 | Aug. 03, 2015 | Aug. 02, 2015
Derivatives And Fair Value [Line Items] |  |  |  |  |  |  |
Fair value transfers out of Level 1 |  |  | $ 0 |  | $ 0 |  |
Fair value transfers out of Level 2 |  |  | $ 0 |  | $ 0 |  |
Remaining shares authorized for issuance |  |  | 670,000,000 |  | 670,000,000 | 670,000,000 | 445,000,000
Dilutive Financing Derivative Liability [Member] |  |  |  |  |  |  |
Derivatives And Fair Value [Line Items] |  |  |  |  |  |  |
Derivative liability |  |  | $ 126,000 |  |  |  |
Common Stock Issuance Agreement [Member] |  |  |  |  |  |  |
Derivatives And Fair Value [Line Items] |  |  |  |  |  |  |
Shares issued per agreement | 853,465 |  |  |  |  |  |
Remaining shares authorized for issuance |  |  | 286,846 | 1,037,053 |  |  |
Common Stock Issuance Agreement [Member] | Dilutive Financing Derivative Liability [Member] |  |  |  |  |  |  |
Derivatives And Fair Value [Line Items] |  |  |  |  |  |  |
Derivative liability | $ 2,300,000 |  |  |  |  |  |
Series B redeemable convertible preferred stock [Member] |  |  |  |  |  |  |
Derivatives And Fair Value [Line Items] |  |  |  |  |  |  |
Common stock closing price |  |  |  |  | $ 3.98 |  |
Gain on derivative liability |  | $ 91,000 |  |  |  |  |

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