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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 16,386 | $ 17,299
Short-term investments | 3,045 | 11,698
Restricted cash | 393 | 393
Accounts receivable | 1,354 | 4,887
Inventory | 4,532 | 1,383
Prepaid expenses and other current assets | 3,347 | 3,930
Total current assets | 29,057 | 39,590
Non-current restricted cash | 597 | 597
Land, buildings, and equipment | 22,549 | 22,860
Other non-current assets | 225 | 280
Total assets | 52,428 | 63,327
Current liabilities: |  |
Accounts payable | 959 | 929
Accrued expenses | 3,058 | 2,891
Accrued compensation | 1,764 | 1,950
Due to related parties | 114 | 766
Current portion of financing lease obligations | 372 | 364
Other current liabilities | 45 | 45
Total current liabilities | 6,312 | 6,945
Financing lease obligations | 17,780 | 17,876
Long-term debt | 1,518 | 1,518
Other non-current liabilities | 1,213 | 113
Total liabilities | 26,823 | 26,452
Stockholders’ equity: |  |
Common stock, $0.0001 par value; 275,000,000 shares authorized; 37,263,339 shares issued and 37,163,187 shares outstanding as of March 31, 2021, and 37,165,196 shares issued and 37,065,044 shares outstanding as of December 31, 2020 | 4 | 4
Additional paid-in capital | 203,565 | 204,807
Common stock in treasury, at cost; 100,152 shares as of March 31, 2021, and December 31, 2020 | (1,043) | (1,043)
Accumulated deficit | (176,921) | (166,893)
Total stockholders’ equity | 25,605 | 36,875
Total liabilities and stockholders’ equity | $ 52,428 | $ 63,327

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