Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 48,506	$ 88,397
Accounts receivable, net	0	653
Income tax receivable	817	0
Prepaid expenses and other current assets	8,675	7,232
Current assets of disposal group held for sale	2,147	2,147
Total current assets	60,145	98,429
Property and equipment, net	2,454	4,012
Right-of-use assets	2,203	0
Other assets	6,227	326
Goodwill	6,072	6,072
Total assets	77,101	108,839
Current liabilities:
Accounts payable	4,315	8,709
Accrued expenses and other current liabilities	30,940	34,157
Warrant liability	5,329	18,731
Current portion of capital lease obligations	0	12
Total current liabilities	40,584	61,609
Convertible notes, net of unamortized discount of $5,639 and $6,333 as of June 30, 2022 and December 31, 2021, respectively	127,086	126,392
Other long-term liabilities	5,537	5,814
Total liabilities	173,207	193,815
Commitments and contingencies
Stockholders' deficit:
Common stock - $0.001 par value. 350,000,000 shares authorized as of June 30, 2022 and December 31, 2021; 190,322,688 and 185,736,890 shares issued as of June 30, 2022 and December 31, 2021, respectively;186,289,978 and 181,872,676 shares outstanding as of June 30, 2022 and December 31, 2021, respectively	150	146
Additional paid-in capital	730,833	722,646
Accumulated deficit	(808,007)	(788,686)
Treasury stock - at cost; 4,032,710 and 3,864,214 shares of common stock as of June 30, 2022 and December 31, 2021, respectively	(19,082)	(19,082)
Total stockholders' deficit	(96,106)	(84,976)
Total liabilities and stockholders' deficit	$ 77,101	$ 108,839