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Financing Arrangements - Schedule of Carrying Value of Term Loan Net of Debt Issuance Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Shares Issued And Outstanding [Line Items]          
Accrued Final Payment $ (33) $ (31) $ (98) $ (129)  
Amount Drawn on Line of Credit     1,000    
Less current portion of Term Loan (3,250)   (3,250)   $ (1,851)
Notes payable long-term portion 2,564   2,564   4,254
Term Loan A [Member]          
Shares Issued And Outstanding [Line Items]          
Principal Amount of Term Loan 4,600   4,600   6,000
Unamortized closing costs (45)   (45)   (57)
Accrued Final Payment     259   162
Amount Drawn on Line of Credit     1,000    
Carrying amount of Term Loan 5,814   5,814   6,105
Less current portion of Term Loan (3,250)   (3,250)   (1,851)
Notes payable long-term portion $ 2,564   $ 2,564   $ 4,254