Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 2)

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Stockholders' Equity (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock-based compensation expense $ 306 $ 530 $ 467 $ 738
Cost of Goods Sold [Member]        
Stock-based compensation expense 24 24
Research and Development Cost [Member]        
Stock-based compensation expense 73 55 160 106
General and Administrative Expense [Member]        
Stock-based compensation expense $ 209 $ 475 $ 283 $ 632