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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Nov. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Sep. 28, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Feb. 28, 2014
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  | $ 39,861,000 |  | $ 26,496,000 |  | $ 93,536,000 | $ 84,803,000 |  |  |  |  |  |  |
Legal fees | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty term |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Impairment of goodwill |  |  | 0 |  | 0 |  | $ 0 | 0 |  |  |  |  |  |  |
Maximum contract value |  |  |  |  |  |  |  |  |  | $ 34,000,000.0 |  |  |  |  |
Loss on extinguishment of debt |  |  | 0 |  | 0 |  | $ 0 | 9,000,000 |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Cumulative-effect of new accounting standard for Topic 326 Credit Losses | (141,496,000) |  | $ (151,973,000) | $ (153,612,000) | $ (162,605,000) | $ (182,245,000) | $ (151,973,000) | $ (162,605,000) | $ (153,612,000) |  | $ (132,719,000) | $ (172,640,000) | $ (72,116,000) |  |
5 Largest Customers | Revenue from Contract with Customer | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  | 31.00% |  | 25.00% |  | 23.00% | 20.00% |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect of new accounting standard for Topic 326 Credit Losses |  |  |  | 100,000 |  |  |  |  | 100,000 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par Value |  |  | $ 56,079,000 | 56,079,000 |  |  | $ 56,079,000 |  | 56,079,000 |  |  |  |  |  |
Senior Convertible Notes due 2034 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par Value |  |  | 1,079,000 | 1,079,000 |  |  | 1,079,000 |  | 1,079,000 |  |  |  |  |  | $ 201,300,000
Interest rate on notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% | 2.75%
Debt extinguished |  | $ 50,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 1,100,000 | 1,079,000 | 1,079,000 |  |  | 1,079,000 |  | 1,079,000 |  |  |  |  | $ 51,300,000 |
Exchange Convertible Senior Notes due 2034 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0 |
Interest rate on notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |
Loss on extinguishment of debt |  |  |  | 3,000,000.0 |  | $ 9,000,000.0 |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0 |
Senior Convertible Notes Due 2024 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par Value |  | $ 55,000,000.0 | 55,000,000 | 55,000,000 |  |  | 55,000,000 |  | 55,000,000 |  |  |  |  |  |
Interest rate on notes |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguished |  | $ 51,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | 55,000,000 | 55,000,000 |  |  | 55,000,000 |  | 55,000,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of debt into common stock (shares) |  |  |  |  |  | 19,460 |  |  |  |  |  |  |  |  |
Cumulative-effect of new accounting standard for Topic 326 Credit Losses | (71,000) |  | (74,000) | (70,000) | $ (70,000) | $ (69,000) | (74,000) | $ (70,000) | (70,000) |  | (71,000) | (69,000) | (49,000) |  |
Common Stock | Senior Convertible Notes due 2034 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of debt into common stock (shares) |  |  |  |  |  | 19,500 |  |  |  |  |  |  |  |  |
Common Stock | Exchange Convertible Senior Notes due 2034 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of debt into common stock (shares) |  |  |  |  |  | 19,500 |  |  |  |  |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect of new accounting standard for Topic 326 Credit Losses | 639,721,000 |  | 658,735,000 | 623,641,000 | 610,956,000 | $ 584,316,000 | $ 658,735,000 | 610,956,000 | 623,641,000 |  | $ 652,736,000 | $ 598,069,000 | $ 558,851,000 |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect of new accounting standard for Topic 326 Credit Losses |  |  |  | $ 100,000 |  |  |  |  | $ 100,000 |  |  |  |  |  |
Intellectual Property Infringement Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from legal settlements | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Commission Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation period |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Maximum | Commission Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation period |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  | 29,210,000 |  | 20,666,000 |  | $ 65,596,000 | 68,728,000 |  |  |  |  |  |  |
Product revenue | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of payment period |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Product revenue | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of payment period |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |
Service revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  | 6,131,000 |  | 5,630,000 |  | $ 16,457,000 | 15,875,000 |  |  |  |  |  |  |
Service revenue | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation period |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Service revenue | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation period |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 3,100,000 |  | $ 0 |  | $ 0 |  | $ 3,163,000 | $ 0 |  |  |  |  |  |  |
Development revenue | One Customer | Revenue from Contract with Customer | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  | 10.00% |  |  |  | 10.00% |  |  |  |  |  |  |  |

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