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Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Beginning balance |  | $ 9,046 | $ 18,068
Assets Acquired Pursuant to Business Combination | $ 0 | 0 |
Impairment Charges | 0 | 7,628 |
Amortization of intangible assets | 793 | 1,394 | 1,002
Ending balance | 8,253 | 9,046 |
Gross Carrying Amount | 10,300 | 10,570 |
Accumulated Amortization | (2,047) | (1,524) |
Developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Beginning balance |  | 9,046 | 17,956
Assets Acquired Pursuant to Business Combination | 0 | 0 |
Impairment Charges | 0 | 7,628 |
Amortization of intangible assets | 793 | 1,282 |
Ending balance | 8,253 | 9,046 |
Gross Carrying Amount | 10,300 | 10,300 |
Accumulated Amortization | (2,047) | (1,254) |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Beginning balance |  |  | 112
Assets Acquired Pursuant to Business Combination |  | 0 |
Impairment Charges |  | 0 |
Amortization of intangible assets |  | 112 |
Ending balance |  | 0 |
Gross Carrying Amount | 0 | 270 |
Accumulated Amortization | 0 | (270) |
us-gaap_DisclosureTotal |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | 793 |  |
Purchased Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 793 | $ 1,394 | $ 1,002

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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