Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net loss attributable to the Company	$ (52,499)	$ (45,703)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and leased property	5,496	5,795
Amortization of intangible assets	338	335
Stock-based compensation	5,123	4,325
Provision for bad debts and other	907
Amortization of debt issuance costs and discount on convertible senior notes	4,340	2,438
Provision for common stock warrants	5,662	5,806
Change in fair value of common stock warrant liability	420	(1,592)
Loss on disposal of leased assets	212
Income tax benefit		(5,865)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable	9,848	(16,178)
Inventory	(25,280)	6,488
Prepaid expenses and other assets	(460)	1,556
Accounts payable, accrued expenses, and other liabilities	1,232	(6,685)
Deferred revenue	(3,827)	4,101
Net cash used in operating activities	(48,488)	(45,179)
Investing Activities
Purchases of property, plant and equipment	(2,844)	(2,343)
Purchases of intangible assets	(1,860)	(879)
Purchases for construction of leased property	(1,987)	(13,138)
Proceeds from sale of lease assets	375
Net cash used in investing activities	(6,316)	(16,360)
Financing Activities
Proceeds from issuance of preferred stock, net of transaction costs	(8)
Proceeds from public offerings, net of transaction costs	28,265
Proceeds from exercise of stock options	205	67
Proceeds from issuance of convertible senior notes, net		95,856
Purchase of capped call and common stock forward		(43,500)
Principal payments on long-term debt	(17,521)	(5,721)
Proceeds from long-term debt	99,546
Proceeds from sale/leaseback transactions accounted for as finance leases		20,000
Repayments of finance obligations	(56,070)	(17,760)
Increase in finance obligations	25,609
Net cash provided by financing activities	80,026	48,942
Effect of exchange rate changes on cash	(48)	(36)
Increase (decrease) in cash, cash equivalents and restricted cash	25,174	(12,633)
Cash, cash equivalents, and restricted cash beginning of period	110,153	68,055
Cash, cash equivalents, and restricted cash end of period	135,327	55,422
Supplemental disclosure of cash flow information
Cash paid for interest	8,673	4,915
Summary of non-cash investing and financing activity
Recognition of right of use asset	$ 34,530	$ 2,513