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Summary of Significant Accounting Policies - Schedule of Financial Instruments Recognized at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Short-term available-for-sale investments |  | $ 226
Restricted cash | 3,964 | 4,026
Total assets recorded at fair value | 3,964 | 4,252
Fair Value, Inputs, Level 1 [Member] |  |
Short-term available-for-sale investments |  | 226
Restricted cash | 3,964 | 4,026
Total assets recorded at fair value | 3,964 | 4,252
Fair Value, Inputs, Level 2 [Member] |  |
Short-term available-for-sale investments |  |
Restricted cash |  |
Total assets recorded at fair value |  |
Fair Value, Inputs, Level 3 [Member] |  |
Short-term available-for-sale investments |  |
Restricted cash |  |
Total assets recorded at fair value |  |

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