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Debt (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Principal Maturities of Long-term Debt
At September 30, 2017, the principal maturities of the long-term debt were as follows:
 
September 30,
2017
2017
$
612

2018
2,620

2019
2,172

Principal balance outstanding
5,404

less: unamortized discount
(164
)
less: unamortized debt issuance costs
(19
)
Long-term debt
5,221

Current portion
2,551

Noncurrent portion
2,670

At December 31, 2016, the principal maturities of the long-term debt were as follows:
 
December 31,
2016
2017
$
1,213

2018
2,623

2019
2,164

Principal balance outstanding
6,000

less: unamortized discount
(298
)
less: unamortized debt issuance costs
(35
)
Long-term debt
5,667

Current portion
1,213

Noncurrent portion
4,454