Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 3,830 $ 1,008 $ 6,694  
Restricted cash 70   70  
Restricted cash included in other assets, noncurrent 70   140  
Total cash, cash equivalents, and restricted cash in the balance sheet $ 3,970 $ 1,148 $ 6,904 $ 351