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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 65,991 $ 91,520
Accounts receivable, net 5,047 6,634
Prepaid expenses and other current assets 13,107 8,107
Current assets of disposal group held for sale 30,181 20,077
Total current assets 114,326 126,338
Property and equipment, net 5,474 8,660
Other assets 146 169
Long-term assets of disposal group held for sale   19,273
Total assets 119,946 154,440
Current liabilities:    
Accounts payable 14,560 12,657
Accrued expenses and other current liabilities 58,172 51,206
Current portion of mortgages payable 74 72
Current portion of capital lease obligations 128 266
Current liabilities of disposal group held for sale 12,703 8,469
Total current liabilities 85,637 72,670
Capital lease obligations, net of current portion   42
Mortgages payable, net of current portion 1,238 1,275
Convertible notes, net of unamortized discount of $8,767 and $9,614 as of June 30, 2021 and December 31, 2020, respectively 157,533 158,886
Embedded derivative liability 388 18,370
Other long-term liabilities 14,759 8,239
Long-term liabilities of disposal group held for sale   1,952
Total liabilities 259,555 261,434
Commitments and contingencies
Stockholders' deficit:    
Common stock - $0.001 par value. 350,000,000 shares authorized as of June 30, 2021 and December 31, 2020; 81,995,756 and 59,287,331 shares issued as of March 31, 2021 and December 31, 2020, respectively; 78,347,655 and 55,772,303 shares outstanding as of June 30, 2021 and December 31, 2020, respectively 82 59
Additional paid-in capital 531,156 452,992
Accumulated deficit (652,069) (541,274)
Treasury stock - at cost; 3,648,101 and 3,515,028 shares of common stock as of June 30, 2021 and December 31, 2020, respectively (18,778) (18,771)
Total stockholders' deficit (139,609) (106,994)
Total liabilities and stockholders' deficit $ 119,946 $ 154,440