Summary of Significant Accounting Policies - Additional Information (Details)
Jan. 01, 2018
|Accounting Policies [Abstract]|
|Restricted cash amount deposited||$ 13,000|
Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef