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Convertible Notes, Debts and Finance Leases - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Apr. 30, 2020 CHF (SFr) | Dec. 31, 2020 USD ($) $ / shares | Sep. 25, 2020 USD ($) $ / shares | Sep. 27, 2019 USD ($) $ / shares | Jun. 26, 2020 USD ($) | Jun. 26, 2020 EUR (€) | Sep. 27, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) day $ / shares | Dec. 31, 2019 USD ($) day $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par Value Per Share | $ / shares |  |  | $ 0.001 |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Loss on convertible debt extinguishment |  |  |  |  |  |  |  |  | $ 1,362,000 | $ 5,695,000 | $ 0 |
Reclassification from APIC to Convertible Debt in Mezzanine Equity |  |  | $ 0 |  |  |  |  |  | 0 | 2,410,000 |  |
Repayments of Convertible Debt |  |  |  |  |  |  |  |  | 7,999,000 | 109,603,000 | $ 0 |
Loans Payable to Bank | [1] |  | 14,974,000 |  |  |  |  |  | 14,974,000 | 16,566,000 |  |
Relief loans (2) | [2] |  | 6,694,000 |  |  |  |  |  | 6,694,000 |  |  |
Societe Generale S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 0.51% |  |  |  |  |  |
Proceeds from Loans | € |  |  |  |  |  |  | € 5,000,000 |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  | 12 months | 12 months |  |  |  |  |
Debt Instrument Term, Option to Extend |  |  |  |  |  | 5 years | 5 years |  |  |  |  |
Relief loans (2) |  |  | $ 6,100,000 |  |  |  |  |  | $ 6,100,000 |  |  |
UBS Switzerland AG [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.00% |  |  |  |  |  | 0.00% |  |  |
Proceeds from Loans | SFr |  | SFr 500,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |  |  |  |
Relief loans (2) |  |  | $ 600,000 |  |  |  |  |  | $ 600,000 |  |  |
Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.00% |  |  |  |  |  | 2.00% |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 0 |  |  |  |  |  | $ 0 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 0 |  |  |  |  |  | 0 |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 25,000,000.0 |  |  |  |  |  | $ 25,000,000.0 |  |  |
One Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity interest period, Variable Rate |  |  |  |  |  |  |  |  | 1 month |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 2.50% |  |  |
Two Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity interest period, Variable Rate |  |  |  |  |  |  |  |  | 2 months |  |  |
Three Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity interest period, Variable Rate |  |  |  |  |  |  |  |  | 3 months |  |  |
LIBOR for interest period of one, two or three months [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 3.00% |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Receivable |  |  | $ 21,500,000 |  |  |  |  |  | $ 21,500,000 |  |  |
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.60% |  |  |  |  |  | 0.60% |  |  |
Loans Payable to Bank |  |  | $ 13,600,000 |  |  |  |  |  | $ 13,600,000 | 15,100,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 1.30% |  |  |
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member] | Euribor Future [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity interest period, Variable Rate |  |  |  |  |  |  |  |  | 1 month |  |  |
Loans From French Government For R&D Innovation Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable to Bank |  |  | $ 1,400,000 |  |  |  |  |  | $ 1,400,000 | 1,500,000 |  |
Convertible Note due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.375% |  |  | 4.375% |  |  | 4.375% |  |  |
Debt Instrument, Face Amount |  |  | $ 37,707,000 |  |  | $ 37,700,000 |  |  | $ 37,707,000 |  |  |
Common Stock, Par Value Per Share | $ / shares |  |  | $ 0.001 |  |  |  |  |  | $ 0.001 |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  | 173.9978 |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 5.75 |  |  |  |  |  | $ 5.75 |  |  |
Fair value of 2022 Notes used to settle 2020 Notes |  |  |  |  |  |  |  |  | $ 44,400,000 |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  | 8,300,000 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  | 36,000,000.0 |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | $ 1,357,000 |  |  | 1,700,000 |  |  | $ 1,357,000 |  |  |
Other Significant Noncash Transaction, Value of Consideration Received |  |  |  |  |  | 37,700,000 |  |  |  |  |  |
Convertible Note due 2022 [Member] | Stock price greater or equal 130 percent of Note Conversion Price [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | day |  |  |  |  |  |  |  |  | 20 |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day |  |  |  |  |  |  |  |  | 30 |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  |  |  |  | 130.00% |  |  |
Convertible Note due 2022 [Member] | Note price less than 98 percent of stock price times conversion rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Debt Instrument, Convertible, Threshold Trading Days | day |  |  |  |  |  |  |  |  | 5 |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day |  |  |  |  |  |  |  |  | 5 |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  |  |  |  | 98.00% |  |  |
Convertible Note due 2022 [Member] | Upon occurrence of specified corporate events [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Convertible Note due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 115,500,000 | $ 115,500,000 |  |  |  |  | 115,500,000 | 115,500,000 |  |
Common Stock, Par Value Per Share | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 115.5001 |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  | $ 8.66 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  | $ 24,900,000 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | 19,294,000 |  |  |  |  |  | $ 19,294,000 | $ 23,652,000 |  |
Convertible Note due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 4.00%
Debt Instrument, Face Amount |  |  |  |  |  | 8,100,000 |  |  |  |  |  | $ 128,250,000
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  | 173.9978 |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  |  | $ 5.75 |  |  | $ 5.75 |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  |  |  |  |  |  | $ 26,100,000
Debt Instrument, Repurchase Amount |  |  |  |  | $ 109,600,000 |  |  | $ 109,600,000 |  |  |  |
Loss on convertible debt extinguishment |  |  | 500,000 |  |  | 800,000 |  |  |  |  |  |
Other Significant Noncash Transaction, Value of Consideration Received |  |  |  |  |  | $ 37,700,000 |  |  |  |  |  |
Convertible Note due 2020 [Member] | Stock price greater or equal 130 percent of Note Conversion Price [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | day |  |  |  |  |  |  |  |  |  | 20 |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day |  |  |  |  |  |  |  |  |  | 30 |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  |  |  |  |  | 130.00% |  |
Convertible Note due 2020 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 45,800,000 |  |
Convertible Debt [Member] | Convertible Note due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on convertible debt extinguishment |  |  |  |  |  |  |  |  |  | $ 5,700,000 |  |
Convertible Debt [Member] | Long-term Debt [Member] | Convertible Note due 2020 [Member] | Privately Negotiated Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | 82,500,000 |  |  |  |  |  |  |
Convertible Debt [Member] | Additional Paid-in Capital [Member] | Convertible Note due 2020 [Member] | Privately Negotiated Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 27,100,000 |  |  |  |  |  |  |
Convertible Debt Settled in Cash and Company's Stocks [Member] | Convertible Note due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  | 7,800,000 |  |  |  |  |  |  |  |  |
Convertible Debt Settled in Cash [Member] | Convertible Note due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
[1] | Loans backed by French R&D tax credit receivables were $13.6 million and $15.1 million as of December 31, 2020 and 2019, respectively. As of December 31, 2020, the French subsidiary had an aggregate of $21.5 million of R&D tax credit receivables from the French government from 2021 through 2024. These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2021 through 2023. The remaining loans of $1.4 million and $1.5 million as of December 31, 2020 and 2019, respectively, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and the loans outstanding at December 31, 2020 mature between 2021 through 2025.
[2] | Refer to the below section “Relief Loans” for the description of these loans.

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- Definition Maturity period on variable rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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