Operating Leases - Balance Sheet Presentation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Balance Sheet Captions
Right-of-use assets	$ 807	$ 906
Operating lease liabilities, current	339	354
Operating lease liabilities	875	977
Other assets
Balance Sheet Captions
Right-of-use assets	807	906
Accrued liabilities
Balance Sheet Captions
Operating lease liabilities, current	339	353
Other long-term liabilities
Balance Sheet Captions
Operating lease liabilities, noncurrent	$ 536	$ 624