Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Details)

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]      
Compensation and related benefits $ 471 $ 1,163  
Accrued warranty (Note 7) 302 338 $ 112
Accrued services 1,309 1,141  
Accrued expenses $ 2,082 $ 2,642