| 2016年 12月31日 | 2017年 12月31日 | 2018年 12月31日 | 2019年 12月31日 | 2020年 12月31日 | 2021年 12月31日 | 2022年 12月31日 |
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Cash and cash equivalents | - | 35 | 1 | 3 | 12 | 26 | 6 |
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Accounts receivable | 5 | 23 | 19 | 60 | 70 | 17 | 36 |
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Unbilled receivables | 0 | 1 | 8 | 5 | 0 | 2 | 0 |
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Inventory | 10 | 9 | 19 | 21 | 19 | 15 | 20 |
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Prepaid expenses and other current assets | 1 | 4 | 3 | 2 | 11 | 14 | 7 |
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Total current assets | 65 | 73 | 50 | 90 | 112 | 74 | 68 |
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Property, plant and equipment, net | 104 | 172 | 248 | 230 | 275 | 262 | 259 |
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Operating lease right-of-use assets | - | - | - | 28 | 32 | 30 | 26 |
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Intangible assets, net | - | - | 18 | 9 | 8 | 7 | 7 |
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Other assets | 0 | 1 | 3 | 4 | 1 | 0 | 0 |
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Total assets | 173 | 247 | 320 | 362 | 428 | 374 | 360 |
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Accounts payable | 2 | 26 | 11 | 4 | 3 | 8 | 14 |
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Total accrued liabilities | - | - | - | - | - | 14 | 13 |
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Current portion of deferred revenue | - | - | 4 | 8 | 7 | 10 | 7 |
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Current portion of long-term debt | - | - | 1 | 6 | 7 | 7 | 6 |
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Operating Lease, Liability, Current | - | - | - | 13 | 7 | 9 | 11 |
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Total current liabilities | 14 | 35 | 25 | 40 | 37 | 49 | 52 |
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Long-term deferred revenue | - | - | - | 2 | 3 | 6 | - |
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Long-term debt | - | - | 48 | 28 | 22 | 15 | 10 |
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Long-term operating lease liabilities | - | - | - | 15 | 27 | 24 | 18 |
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Deferred Income Tax Liabilities, Net | - | - | 18 | 24 | 33 | 22 | 18 |
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Asset retirement obligation | 1 | 9 | 13 | 6 | 15 | 16 | 19 |
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Other non-current liabilities | - | - | - | - | 1 | 0 | 0 |
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Total liabilities | 31 | 57 | 111 | 117 | 139 | 133 | 117 |
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Common Stock, Value, Issued | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Treasury stock, at cost, 2,010,961 and 1,777,001 shares at December 31, 2022 and 2021, respectively | 1 | 1 | 3 | 3 | 4 | 5 | 5 |
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Additional paid-in capital | 133 | 159 | 162 | 165 | 171 | 174 | 178 |
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Retained earnings | 10 | 32 | 50 | 82 | 121 | 71 | 70 |
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Accumulated other comprehensive income | - | - | -0 | -0 | 0 | 1 | 0 |
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Total stockholders’ equity | 142 | 190 | 209 | 244 | 289 | 241 | 243 |
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Total liabilities and stockholders’ equity | 173 | 247 | 320 | 362 | 428 | 374 | 360 |
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