Operating Leases - Balance Sheet Presentation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet
Right-of-use assets	$ 906
Operating lease liabilities, current	354	$ 0
Operating lease liabilities	977
Other assets
Balance Sheet
Right-of-use assets	906
Accrued liabilities
Balance Sheet
Operating lease liabilities, current	353
Other long-term liabilities
Balance Sheet
Operating lease liabilities, noncurrent	$ 624