CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net loss attributable to the Company	$ (85,465)	$ (78,115)	$ (127,080)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and leased property	11,989	11,014	9,190
Amortization of intangible assets	698	693	593
Stock-based compensation	10,890	8,771	9,209
Provision for bad debts and other assets	1,981	1,626	250
Amortization of debt issuance costs and discount on convertible senior notes	8,821	6,347	770
Provision for common stock warrants	6,513	10,190	36,360
Change in fair value of common stock warrant liability	(79)	(4,286)	15,188
Loss on disposal of leased assets	212
Income tax benefit		(9,217)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable	10,646	(14,398)	(9,951)
Inventory	(24,481)	19,041	(18,836)
Prepaid expenses, and other assets	(8,110)	(4,654)	2,157
Accounts payable, accrued expenses, and other liabilities	19,879	(10,266)	11,430
Accrual for loss contracts related to service			(752)
Deferred revenue	(5,016)	5,637	11,290
Net cash used in operating activities	(51,522)	(57,617)	(60,182)
Investing Activities
Purchases of property, plant and equipment	(5,683)	(5,142)	(4,090)
Purchase of intangible asset	(2,404)	(929)
Purchases for construction of leased property	(6,532)	(13,501)	(40,273)
Proceeds from sale of leased assets	375
Net cash used in investing activities	(14,244)	(19,572)	(44,363)
Financing Activities
Proceeds from issuance of preferred stock and warrants, net of transaction costs	14,089	30,934	17,636
Proceeds from public offerings, net of transaction costs	158,428	7,195	22,992
Proceeds from exercise of stock options	1,217	138	97
Payments for redemption of preferred stock	(4,040)		(3,700)
Proceeds from issuance of convertible senior notes, net	39,052	95,856
Purchase of capped call and common stock forward		(43,500)
Proceeds from borrowing of long-term debt, net of transaction costs	119,186		20,147
Principal payments on long-term debt	(24,827)	(16,190)	(12,292)
Proceeds from sale/leaseback transactions accounted for as finance obligations	83,668	76,175	45,368
Repayments of finance obligations	(61,713)	(31,264)	(18,632)
Net cash provided by financing activities	325,060	119,344	71,616
Effect of exchange rate changes on cash	53	(57)	348
Increase (decrease) in cash, cash equivalents and restricted cash	259,347	42,098	(32,581)
Cash, cash equivalents, and restricted cash beginning of period	110,153	68,055	100,636
Cash, cash equivalents, and restricted cash end of period	369,500	110,153	68,055
Supplemental disclosure of cash flow information
Cash paid for interest	19,180	13,057	8,791
Summary of non-cash investing and financing activity
Recognition of right of use asset	127,370	79,057
Net transfers between inventory, leased assets and property, plant and equipment		$ 18,175
Conversion of preferred stock to common stock	$ 28,392		$ 8,222