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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2017
Related Party Transactions
Related Party Transactions	4. Related Party Transactions Other assets includes receivables from related parties of $0.5 million and $0.9 million as of June 30, 2017 and December 31, 2016, respectively. Also, prior to its initial public offering, the Company had historically incurred interest expense payable to related parties on its outstanding convertible notes and bonds with common stock warrants. Related party interest expense totaled $7.6 million and $15.1 million for the three and six months ended June 30, 2016, respectively.