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Revenue | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Revenue | Revenue The following tables represent a disaggregation of revenue from contracts with customers for the periods presented (in thousands): Sales by End Market
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020 |  |
Industrial |  |  |  |  | $ | 21,400 |  |  | $ | 15,990 |  |  |
Microfabrication |  |  |  |  | 15,215 |  |  | 10,419 |  |  |
Aerospace and Defense |  |  |  |  | 24,730 |  |  | 16,806 |  |  |
|  |  |  |  | $ | 61,345 |  |  | $ | 43,215 |  |  |
Sales by Geography
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020 |  |
North America |  |  |  |  | $ | 31,134 |  |  | $ | 21,046 |  |  |
China |  |  |  |  | 15,577 |  |  | 12,042 |  |  |
Rest of World |  |  |  |  | 14,634 |  |  | 10,127 |  |  |
|  |  |  |  | $ | 61,345 |  |  | $ | 43,215 |  |  |
Sales by Timing of Revenue
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020 |  |
Point in time |  |  |  |  | $ | 46,994 |  |  | $ | 36,930 |  |  |
Over time |  |  |  |  | 14,351 |  |  | 6,285 |  |  |
|  |  |  |  | $ | 61,345 |  |  | $ | 43,215 |  |  |
The Company's contract assets and liabilities are as follows (in thousands):
| Balance Sheet Classification |  | As of
|  | March 31, 2021 |  | December 31, 2020
Contract assets | Prepaid expenses and other current assets |  | $ | 4,329 |  |  | $ | 5,680 |
Contract liabilities | Deferred revenue and Other long-term liabilities |  | 4,203 |  |  | 2,985 |
During the three months ended March 31, 2021 and 2020, the Company recognized revenue of $1.3 million and $0.2 million, respectively, that was included in the deferred revenue balances at the beginning of the periods as the performance obligations under the associated agreements were satisfied.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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