Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 54,136	$ 91,520
Accounts receivable, net	1,917	6,634
Prepaid expenses and other current assets	10,372	8,107
Current assets of disposal group held for sale	26,545	20,077
Total current assets	92,970	126,338
Property and equipment, net	4,564	8,106
Other assets	147	169
Long-term assets of disposal group held for sale		19,827
Total assets	97,681	154,440
Current liabilities:
Accounts payable	7,989	12,657
Accrued expenses and other current liabilities	40,850	51,206
Warrant liability	42,402
Current portion of mortgages payable	75	72
Current portion of capital lease obligations	35	266
Current liabilities of disposal group held for sale	11,922	8,469
Total current liabilities	103,273	72,670
Capital lease obligations, net of current portion		42
Mortgages payable, net of current portion	1,219	1,275
Convertible notes, net of unamortized discount of $8,255 and $9,614 as of September 30, 2021 and December 31, 2020, respectively	156,045	158,886
Embedded derivative liability		18,370
Other long-term liabilities	14,110	8,239
Long-term liabilities of disposal group held for sale		1,952
Total liabilities	274,647	261,434
Commitments and contingencies
Stockholders' deficit:
Common stock - $0.001 par value. 350,000,000 shares authorized as of September 30, 2021 and December 31, 2020; 123,279,683 and 59,287,331 shares issued as of September 30, 2021 and December 31, 2020, respectively; 119,567,684 and 55,772,303 shares outstanding as of September 30, 2021 and December 31, 2020, respectively	83	59
Additional paid-in capital	537,548	452,992
Accumulated deficit	(695,813)	(541,274)
Treasury stock - at cost; 3,711,999 and 3,515,028 shares of common stock as of September 30, 2021 and December 31, 2020, respectively	(18,784)	(18,771)
Total stockholders' deficit	(176,966)	(106,994)
Total liabilities and stockholders' deficit	$ 97,681	$ 154,440