Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Components of Inventory (Details)

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Summary of Significant Accounting Policies - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Raw materials $ 1,493 $ 1,404
Work in process 366 466
Finished goods 133 866
Total inventory $ 1,992 $ 2,736