Summary of Significant Accounting Policies - New Lease Standards (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 5,763	$ 6,415
Operating lease liabilities, current portion	1,140	945
Other accrued liabilities		2,271	$ 2,414
Operating lease liabilities, long-term portion	$ 5,931	6,900
Deferred rent			$ 1,287
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		6,415
Operating lease liabilities, current portion		945
Other accrued liabilities		(143)
Operating lease liabilities, long-term portion		6,900
Deferred rent		$ (1,287)