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