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Credit Agreement
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Credit Agreement

13.

Credit Agreement

Line of credit

In September 2015, we entered into a two-year unsecured line of credit agreement (the “Credit Agreement”) with JPMorgan Chase Bank, N.A. in the principal amount of up to $12.0 million. In September 2016, the Credit Agreement was modified to extend the final due date an additional year to September 2018, at which point it expired. No borrowings were ever outstanding under the Credit Agreement.