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Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net loss attributable to common stockholders	$ (78,083)	$ (159,163)	$ (61,833)	$ (49,916)	$ (69,208)	$ (111,666)	$ (48,136)	$ (54,992)	$ (348,995)	$ (284,002)	$ (200,042)
Denominator:
Weighted-average common shares outstanding - basic and diluted (in shares)									185,790,021	153,355,144	134,401,588
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									63,120,000	61,766,000	60,232,000
Options to purchase common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									15,810,000	15,181,000	15,528,000
Convertible debt
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									40,850,000	40,850,000	40,850,000
Outstanding warrants, convertible to common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									2,657,000	3,110,000	3,110,000
Unvested restricted stock units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									3,712,000	2,575,000	744,000
Vested restricted stock units, unissued
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									91,000	50,000	0

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