Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets	$ 2,235	$ 2,822
Deferred rent non-current			$ 84
Operating lease liabilities	$ 417	$ 696
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities and Other Liabilities, Current	Accrued Liabilities and Other Liabilities, Current
Non-current operating lease liabilities	$ 1,902	$ 2,278
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Prior to ASC 842 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent non-current	$ 84
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting standards update adopted	true
Transition method of ASU adoption	Modified Retrospective
Practical expedients package adopted	false
ASU 2016-02 | As Adjusted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets	$ 2,235
Deferred rent non-current	(84)
Operating lease liabilities	417
Non-current operating lease liabilities	$ 1,902