Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (30,543)	$ (18,218)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	1,829	498
Loss on impairment of long-lived assets	5,784
Stock-based compensation expense	1,966	3,399
Write-off lease receivable/prepaid commission assets	1,383
Changes in assets and liabilities, net of acquisition
Prepaid expenses and other assets	1,299	(2,782)
Accounts payable	1,422	652
Deferred revenue	6,315	(146)
Accrued and other liabilities	(1,624)	(484)
Net cash used in operating activities	(12,169)	(17,081)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	2,266	25,127
Proceeds from issuance of common stock in connection with exercise of options	315	95
Proceeds from issuance of common stock in connection with employee benefit plans	80	28
Proceeds from issuance of common stock in private placement, net of issuance costs	4,922
Net cash provided by financing activities	7,583	25,250
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,586)	8,169
Cash, cash equivalents and restricted cash at beginning of period	67,557	59,388
Cash, cash equivalents and restricted cash at end of period	62,971	67,557
Supplemental disclosure of noncash items
Right-of-use asset acquired through operating lease	$ 470
Property and equipment recorded upon adoption of ASU 2016-02		$ 2,151