Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (15,837,000)	$ (7,748,000)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	1,153,000	248,000
Impairment of long-lived assets	2,870,000		$ 0
Stock-based compensation expense	1,205,000	1,989,000
Write-off lease receivable/prepaid commission assets	1,383,000
Changes in assets and liabilities
Prepaid expenses and other assets	637,000	(3,118,000)
Accounts payable	(177,000)	284,000
Deferred revenue		(146,000)
Accrued and other liabilities	(1,330,000)	(117,000)
Net cash used in operating activities	(10,096,000)	(8,608,000)
Cash flows from financing activities
Proceeds from issuance of common stock in connection with employee benefit plans	108,000	13,000
Proceeds from issuance of common stock in private placement	4,922,000
Net cash provided by financing activities	5,030,000	13,000
Net change in cash, cash equivalents, and restricted cash	(5,066,000)	(8,595,000)
Cash, cash equivalents, and restricted cash at beginning of period	67,557,000	59,388,000	59,388,000
Cash, cash equivalents, and restricted cash at end of period	$ 62,491,000	$ 50,793,000	$ 67,557,000