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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Discontinued Operations And Disposal Groups [Abstract] |  |
Product revenue |  | $ 901
Cost of revenue |  | 857
Gross profit |  | 44
Operating expenses: |  |
Research and development |  | 656
Sales and marketing |  | 411
General and administrative |  | 185
Total operating expenses |  | 1,252
Operating loss |  | (1,208)
Other income (expense) |  | 112
Loss from discontinued operations |  | (1,096)
Loss from sale of business |  | (6,508)
Net loss from discontinued operations | $ 0 | $ (7,604)

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- Definition Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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