Summary of Significant Accounting Policies - Summary of Impact of Adoption of Topic 842 (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 11,300
Other current liabilities	1,977		$ 968
Long-term portion of lease liabilities	$ 14,558		$ 4,442
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 11,932
Other current liabilities		1,997
Long-term portion of lease liabilities		15,357
Restatement Adjustment [Member] | ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets		11,932
Other current liabilities		1,029
Long-term portion of lease liabilities		$ 10,915