Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Short-term debt:
Current portion of long-term debt	$ 160	$ 45
Total short-term debt	160	45
Long-term debt:
Capital lease obligations	303	51
Other unsecured promissory notes	499	132
Total	802	183
Less: current portion of long-term debt	(160)	(45)
Total long-term debt	$ 642	$ 138