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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	17. Related Party Transactions Related parties of the Company held approximately 4%, 7% and 7% of the outstanding shares of Silver Creek Series A and Series B preferred stock as of December 31, 2017, 2016 and 2015, respectively. No shares of Silver Creek Series C preferred stock issued during 2017 or 2016 were held by related parties of the Company as of December 31, 2017, 2016 or 2015.