Annual report pursuant to Section 13 and 15(d)

Accrued Expenses and Long-term Liabilities - Schedule of Long Term Liabilities (Details)

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Accrued Expenses and Long-term Liabilities - Schedule of Long Term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Warrant liability $ 82 $ 361
Uncertain tax positions 4,081 3,838
Deferred revenue 269
Other 141 120
Total other long-term liabilities $ 4,573 $ 4,319