Exhibit 12.1

Calculation of Consolidated Ratios of Earnings to Fixed Charges

	9/30/2017			12/31/2016			12/31/2015			12/31/2014			12/31/2013			12/31/2012
Fixed Charges:
Interest expense on indebtedness	$	2,035		$	2,716			10,365		$	9,717			6,408			466
Noncash interest expense and other		3,297			19,733			8,404			8,510			4,530			88
Interest expense on portion of rent expense representative of interest		1,099			1,554			1,428			1,140			1,822			1,439
Total Fixed Charges		6,431			24,003			20,197			19,367			12,760			1,993
Earnings (loss):
Net income (loss) before benefit for income taxes		(96,457	)		(169,508	)		(162,834	)		(47,083	)		(97,917	)		(66,920	)
Fixed charges per above		6,431			24,003			20,197			19,367			12,760			1,993
Total earnings (loss)		(90,026	)		(145,505	)		(142,637	)		(27,716	)		(85,157	)		(64,927	)
Ratio of earnings to fixed charges		N/A			N/A			N/A			N/A			N/A			N/A
Deficiency of earnings available to cover fixed charges		(96,457	)		(169,508	)		(162,834	)		(47,083	)		(97,917	)		(66,920	)