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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
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.