Net (Loss)/Income Per Share - Antidilutive Shares (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti dilutive securities excluded from computation of diluted net loss per share	21,449	20,051	13,051
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti dilutive securities excluded from computation of diluted net loss per share	4,267	3,832	2,362
Common shares subject to restrictions [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti dilutive securities excluded from computation of diluted net loss per share	1,004	3,639	1,596
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti dilutive securities excluded from computation of diluted net loss per share	8,490	6,804	6,347
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti dilutive securities excluded from computation of diluted net loss per share	7,688	5,776	2,746