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Balance Sheet Components | 3 Months Ended
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Mar. 31, 2021
Balance Sheet Components |
Balance Sheet Components | 4. Balance Sheet Components ​ 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
​ 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
​ ​ ​ ​ ​ Deferred Revenue ​ In the three months ended March 31, 2021, the Company executed contractual arrangements with a customer for the development of a RAD-Hard product, consisting of a technology license, design license agreement and development subcontract. The Company does not share in the rights to future revenues or royalties. The total arrangements are for $6.5 million in consideration. ​ The Company concluded these contractual arrangements represent one arrangement and evaluated its promises to the customer and whether the performance obligations granted under the arrangement were distinct. The licenses provided to the customer are not transferable, are of limited value without the promised development services, and the customer cannot benefit from the license agreements without the specific obligated services in the development subcontract, as there is strong interdependency between the licenses and the development subcontract. Accordingly, the Company determined the licenses were not distinct within the context of the contract and combined the license with other performance obligations. ​ As a result, the Company expects to recognize revenue related to the performance obligations over time and expects to begin recognizing revenue in the second quarter of 2021 over the performance obligation time period. No revenue was recorded during the three months ended March 31, 2021. ​ Under the agreements, we received a non-refundable, upfront payment of $3.0 million, which was recorded as deferred revenue, current, as of March 31, 2021, as the Company expects to recognize this to revenue within the next twelve months.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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