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Summary of Significant Accounting Policies - Summarized Financial Data of Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | $ 316,092 | $ 320,469 | $ 141,892
Operating loss | $ (32,590) | $ (28,821) | $ (23,222) | $ (40,533) | $ (34,395) | $ (7,916) | $ (17,430) | $ (87,123) | (125,166) | (146,864) | (69,962)
Other, net |  |  |  |  |  |  |  |  | (47,865) | 68,830 | (10,497)
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current assets | 77,761 |  |  |  | 28,123 |  |  |  | 77,761 | 28,123 |
Non-current assets | 11,040 |  |  |  | 1,539 |  |  |  | 11,040 | 1,539 |
Total assets | 88,801 |  |  |  | 29,662 |  |  |  | 88,801 | 29,662 |
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 11,588 |  |  |  | 6,274 |  |  |  | 11,588 | 6,274 |
Net assets | $ 77,213 |  |  |  | $ 23,388 |  |  |  | 77,213 | 23,388 |
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 417 | 1,176 | 940
Operating expenses |  |  |  |  |  |  |  |  | 62,373 | 32,513 | 17,289
Operating loss |  |  |  |  |  |  |  |  | (61,956) | (31,337) | (16,349)
Other, net |  |  |  |  |  |  |  |  | 1,535 | (64) | 35
Net loss |  |  |  |  |  |  |  |  | $ (60,421) | $ (31,401) | $ (16,314)

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- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 + Details
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