Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (29,713)	$ (82,776)
Adjustments to reconcile loss to net cash used in operating activities:
Depreciation and amortization	53	12
Stock-based compensation	22,729	14,032
Amortization of debt discount and debt issuance costs	1,282	1,687
Amortization of intangible asset	484	484
Changes in assets and liabilities:
Accounts receivable, net	(37,060)	(2,330)
Other receivables		(25,654)
Inventory	3,245	(13,413)
Prepaid and other current assets	(9,914)	520
Other long-term assets	(900)
Accrued interest payable	(145)	(371)
Deferred revenue	(1,131)	1,902
Accounts payable and other current liabilities	54,962	36,005
Other long-term liabilities	(4,322)	7,502
Net cash used in operating activities	(430)	(62,400)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of furniture, fixtures and equipment	(2,114)	(53)
Net cash used in investing activities	(2,114)	(53)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of transaction costs for conversion of preferred stock		(39)
Proceeds from issuance of common stock under employee stock purchase plan		423
Proceeds from issuance of common stock, net of transaction costs	440,945	70,007
Proceeds from exercise of stock options, net of transaction costs	19,544	16,494
Payment on long-term debt from royalty-bearing instrument	(21,441)	(10,539)
Taxes paid related to stock-based awards	(10,120)	(5,638)
Net cash provided by financing activities	428,928	70,708
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	426,384	8,255
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	250,727	74,237
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	677,111	82,492
Cash paid during the year for:
Interest	3,577	16,030
Income taxes	87	$ 825
Supplemental disclosure of non-cash transactions:
Initial recognition of operating lease right-of-use asset	$ 8,995