Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Restricted cash	$ 20,000	$ 20,000
Right-of-use assets	1,899,000
Operating lease, liability	1,928,000
ASU 2016-02
Significant Accounting Policies [Line Items]
Right-of-use assets	2,000,000
Operating lease, liability	$ 2,000,000
Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful lives	three
Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful lives	five