Operating Leases - Balance Sheet Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Balance Sheet Captions
Right-of-use assets	$ 731	$ 906
Operating lease liabilities, current	349	354
Operating lease liabilities	794	977
Other assets
Balance Sheet Captions
Right-of-use assets	731	906
Accrued liabilities
Balance Sheet Captions
Operating lease liabilities, current	349	353
Other long-term liabilities
Balance Sheet Captions
Operating lease liabilities, noncurrent	$ 445	$ 624