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Prepaid Expenses and Other Current Assets - Summary of Prepaids and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid inventory $ 2,456 $ 2,195
Restricted cash 307 307
Prepaid insurance 964 1,967
Other 1,130 926
Prepaid and other current assets $ 4,857 $ 5,395