Debt - Chinese Credit Facilities - Additional Information (Details) - Chinese Credit Facilities	6 Months Ended
	Jun. 30, 2017 USD ($) CreditFacility	Jun. 30, 2017 CNY (¥)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings	$ 7,000,000		$ 7,000,000
Number of credit facilities | CreditFacility	2
Chinese Credit Facility Boa
Debt Instrument [Line Items]
Outstanding borrowings	$ 0
Borrowing capacity under Credit Facility	$ 30,000,000
Period of credit facility	1 year
Interest rate description	Borrowings under our Chinese Credit Facility—BOA generally bear interest at a rate based on People’s Bank of China benchmark, including certain adjustments which may be made in accordance with the market condition at the time of borrowing.
Chinese Credit Facility JPM
Debt Instrument [Line Items]
Outstanding borrowings	$ 7,000,000
Borrowing capacity under Credit Facility	$ 10,000,000	¥ 70,000,000
Period of credit facility	1 year
Interest rate description	Borrowings under our Chinese Credit Facility—JPM generally bear interest at a rate based on People’s Bank of China benchmark, including certain adjustments which may be made in accordance with the market condition at the time of borrowing.
Line of credit, interest rate basis	4.47%	4.47%