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Balance Sheet Components (Tables) | 3 Months Ended
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Mar. 31, 2021
Balance Sheet Components |
Schedule of Inventory | Inventory consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Raw materials | ​ | $ | 391 | ​ | $ | 329
Work-in-process | ​ |  | 4,779 | ​ |  | 4,910
Finished goods | ​ |  | 188 | ​ |  | 482
Total inventory | ​ | $ | 5,358 | ​ | $ | 5,721
Schedule of accrued liabilities | Accrued liabilities consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Payroll-related expenses | ​ | $ | 1,691 | ​ | $ | 1,274
Inventory | ​ | ​ | 236 | ​ | ​ | 416
Other | ​ |  | 221 | ​ |  | 542
Total accrued liabilities | ​ | $ | 2,148 | ​ | $ | 2,232

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