Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (97,316)	$ (95,115)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	3,186	2,059
Amortization and accretion	13,358	5,051
Stock-based compensation	20,705	23,315
Other non-cash	7	(155)
Changes in operating assets and liabilities
Accounts receivable, net	(4,724)	(22,936)
Inventory	2,397	(14)
Prepaid, current and other assets	(861)	(3,572)
Accounts payable, accrued expenses and other current liabilities	1,484	8,567
Operating lease liabilities	(2,929)	(2,309)
Net cash used in operating activities	(64,693)	(85,109)
Cash flows from investing activities
Purchase of available-for-sale investments	(43,455)	0
Proceeds from sales and maturities of investments	118,357	0
Purchase of property, plant and equipment	(1,690)	(7,118)
Net cash provided by (used in) investing activities	73,212	(7,118)
Cash flows from financing activities
Proceeds from loan	8,274	0
Repayments of Debt	(8,274)	0
Payments related to issuance of stock for stock-based compensation arrangements, net	(1,160)	(968)
Payments of debt issuance costs	0	(396)
Proceeds from exercise of warrants	0	375
Other financing	0	(239)
Net cash used in financing activities	(1,160)	(1,228)
Net change in cash and cash equivalents	7,359	(93,455)
Cash and cash equivalents, at beginning of period	143,940	202,818
Cash and cash equivalents, at end of period	151,299	109,363
Non-cash investing and financing activities
Purchase of property, plant and equipment	$ 409	$ 917