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Summary of Significant Accounting Policies - Summarized Unaudited Financial Information for the Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating expenses | $ 89,703 | $ 75,723 | $ 174,588 | $ 159,694 |
Operating loss | (35,270) | (23,222) | (66,651) | (63,755) |
Other | 18,128 | (22,347) | 21,546 | (43,772) |
Equity Method Investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Current assets | 67,361 |  | 67,361 |  | $ 77,761
Non-current assets | 13,109 |  | 13,109 |  | 11,040
Total assets | 80,470 |  | 80,470 |  | 88,801
Current liabilities | 12,950 |  | 12,950 |  | 11,588
Non-current liabilities | 3,177 |  | 3,177 |  | 0
Total liabilities | 16,127 |  | 16,127 |  | 11,588
Net assets | 64,343 |  | 64,343 |  | $ 77,213
Revenues | 87 | 47 | 117 | 329 |
Operating expenses | 10,092 | 14,383 | 23,435 | 32,043 |
Operating loss | (10,005) | (14,336) | (23,318) | (31,714) |
Other | (68) | 1,424 | (63) | 1,427 |
Net loss | $ (10,073) | $ (12,912) | $ (23,381) | $ (30,287) |

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