Line of Credit and Short-Term Borrowings - Additional Information (Detail)
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12 Months Ended |
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Oct. 24, 2018
USD ($)
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Oct. 19, 2018
CNY (¥)
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Sep. 20, 2018
USD ($)
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Dec. 31, 2018
USD ($)
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Oct. 24, 2018
CNY (¥)
Installment
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Sep. 20, 2018
CNY (¥)
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Dec. 31, 2017
USD ($)
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Jun. 30, 2015
USD ($)
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| Line of Credit [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility |
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$ 250,000,000
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| Line of credit facility, interest rate |
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Borrowings bear interest at the Company’s election based on (a) LIBOR or (b) the greater of (i) the Prime Rate, (ii) the Federal Funds Rate plus 0.5% and (iii) LIBOR for a 30-day period plus 1.0%, in each case, plus an applicable margin based on the average daily principal balance of revolving loans available under the Credit Agreement.
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| Line of credit facility, expiration period |
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5 years
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| Line of credit facility, outstanding amount |
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$ 100,000
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$ 100,000
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| Maturity date of credit agreement |
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Jun. 30, 2020
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| Unused line of credit fee |
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0.25%
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| Line of Credit [Member] | Other Assets [Member] |
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| Debt Instrument [Line Items] |
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| Debt closing and arrangement fees |
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$ 1,100,000
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| Line of Credit [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Line of credit, increase |
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$ 100,000,000
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| LIBOR Loans [Member] | Line of Credit [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate of line of credit agreement |
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1.00%
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| Federal Funds Rate [Member] | Line of Credit [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate of line of credit agreement |
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0.50%
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| China USD Loan Agreement [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility | ¥ |
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¥ 17,500,000
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| Line of credit facility, interest rate |
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Interest will be paid at one, two or three months, depending on the period of the drawdown. The interest rate will be based upon the London Interbank Offered Rate (“LIBOR”) plus 1.2% per annum.
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| Line of credit facility, frequency of payment and payment term |
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the principal of the loan will be repayable by fifteen equal quarterly installments of $437,550, commencing fifteen months after drawdown plus a final installment of $10,937,500
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| Number of quarterly installments | Installment |
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15
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| Line of credit facility, quarterly principal payment |
437,550
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| Line of credit facility, final principal payment |
$ 10,937,500,000
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| Line of credit facility, expiration period |
5 years
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| Line of credit facility, outstanding amount |
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$ 0
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| China USD Loan Agreement [Member] | LIBOR Loans [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate of line of credit agreement |
1.20%
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| China DC Revolving Loan Agreement [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility | ¥ |
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¥ 50,000,000
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| Line of credit facility, outstanding amount |
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$ 0
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| Debt instrument maturity date |
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Oct. 18, 2019
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| Revolving Loan Agreement [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility |
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$ 125,000,000
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| Line of credit facility, interest rate |
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Interest will be paid at one, two or three months, depending on the term of each loan. The interest rate will be equal to 100% of the applicable People’s Bank of China (“PBOC”) Benchmark Lending Rate, provided that if the PBOC Benchmark Lending Rate changes during the term of a loan, the applicable interest rate for that loan will not change until the next rollover date of that loan (if any).
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| Line of credit facility, frequency of payment and payment term |
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The term of each loan will be one, three or six months or such other period as agreed by the lender. The term of a loan, including any extension or rollover, shall not exceed twelve months.
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| Line of credit facility, outstanding amount |
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$ 0
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| Line of Credit Facility, Interest Rate During Period |
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100.00%
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| Revolving Loan Agreement [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Line of credit facility, interest rate |
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twelve months
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| Revolving Loan Agreement [Member] | Yuan Revolving Loan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility | ¥ |
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¥ 125,000,000
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| Revolving Loan Agreement [Member] | Yuan Non-Financial Bank Guarantee Facility [Member] |
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| Debt Instrument [Line Items] |
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| Maximum amount of credit facility | ¥ |
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¥ 15,000,000
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