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Inventory | 3 Months Ended
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Mar. 31, 2021
Inventory |
Inventory | 7. Inventory ​ Inventory as of March 31, 2021 and December 31, 2020 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of March 31, | ​ | As of December 31,
​ | ​ | 2021 | ​ | 2020
Raw materials | ​ | $ | 5,011 | ​ | $ | 3,514
Work in process | ​ | ​ | 802 | ​ | ​ | 1,096
Finished goods | ​ | ​ | 9,685 | ​ | ​ | 11,004
Total inventory | ​ | $ | 15,498 | ​ | $ | 15,614
​ The aggregate charges related to excess inventory for the three months ended March 31, 2021 and 2020 were immaterial. These expenses were recorded as a component of cost of product revenues. During the three months ended March 31, 2021 and 2020, inventory used in the construction and installation of property and equipment was $516 and $394, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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