Convertible Note Receivable - Additional Information (Details) - USD ($)	May 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]
Convertible notes receivable		$ 1,000,000	$ 0
Accrued interest		$ 4,000
Convertible Loan Agreement [Member] | Simax Precision Technologies Limited [Member]
Loans And Leases Receivable Disclosure [Line Items]
Funds available in multiple promissory notes	$ 15,000,000
Convertible notes rate of interest	4.25%
Term of repayment for principal amount and outstanding interest	3 years