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Balance Sheet Components - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 2,200,000 | $ 1,500,000 | $ 1,800,000
Capitalized costs | 4,000,000 | 500,000 | 0
Internal-use software and platform development costs capitalized, amortization expense | 100,000 | 0 | 1,000,000
Amortization of intangible assets | 2,700,000 | 2,700,000 | 5,700,000
Carrying amount | 6,004,000 | 8,672,000 |
Developed technology and trade names |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization of intangible assets |  |  | 2,900,000
Developed technology |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Carrying amount | $ 0 | 0 | 2,600,000
User relationships |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization of intangible assets |  |  | $ 2,700,000
Intangible asset, useful life | 2 years 3 months 18 days |  |
Carrying amount | $ 6,004,000 | $ 8,672,000 |

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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=109223946&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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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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