Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (18,067)	$ (39,025)	$ (135,682)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		79	1,806
Stock-based compensation		5,637	8,690
Amortization of debt issuance costs		29	726
Asset Impairment Charges	0	0	1,600
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable		236	25,656
(Increase) decrease in inventory		0	254
(Increase) decrease in prepaid expenses and other current assets		451	(4,141)
Decrease in other assets		261	207
Decrease in accounts payable and other liabilities		(14,707)	32,532
Net cash provided by (used in) operating activities		(47,039)	(68,352)
Cash flows from investing activities:
Purchases of property and equipment		(985)	0
Purchases of investments		(24,373)	(37,148)
Maturities of investments		21,772	158,000
Net cash (used in) provided by investing activities		(3,586)	120,852
Cash flows from financing activities:
Proceeds from issuance of common stock		16,924	0
Repurchase of common stock		(2,675)	(1,026)
Repayment of debt borrowings, net of fees		0	(643)
Net cash used in financing activities		14,249	(1,669)
Net increase (decrease) in cash and cash equivalents		(36,376)	50,831
Cash and cash equivalents at beginning of period		126,263	36,112
Cash and cash equivalents at end of period	89,887	89,887	86,943
Supplemental disclosure of cash flow information:
Cash paid for interest		307	$ 9,569
Initial recognition of right of use asset	1,704	1,704
Operating Lease, Right-of-Use Asset	2,700	$ 2,700
Issuance of common stock under Equity Incentive Plans, value	$ 8